diff --git a/.nblink/environment.yml b/.nblink/environment.yml
new file mode 100644
index 0000000..1a3118c
--- /dev/null
+++ b/.nblink/environment.yml
@@ -0,0 +1,11 @@
+name: engineersCode
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+  - https://prefix.dev/conda-forge
+dependencies:
+  - xeus-python
+  - numpy
+  - matplotlib
+  - imageio
+  - ipywidgets
+  - ipympl
diff --git a/.nblink/nblink-lock.json b/.nblink/nblink-lock.json
new file mode 100644
index 0000000..3d66077
--- /dev/null
+++ b/.nblink/nblink-lock.json
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+      "name": "python-dateutil",
+      "build": "pyhe01879c_2",
+      "version": "2.9.0.post0",
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+      },
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+    "pytz-2026.1.post1-pyhcf101f3_0.conda": {
+      "name": "pytz",
+      "build": "pyhcf101f3_0",
+      "version": "2026.1.post1",
+      "subdir": "noarch",
+      "channel": "conda-forge",
+      "hash": {
+        "md5": "f8a489f43a1342219a3a4d69cecc6b25",
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+      "name": "qhull",
+      "build": "h0b0027f_1",
+      "version": "2020.2",
+      "subdir": "emscripten-wasm32",
+      "channel": "emscripten-forge-4x",
+      "hash": {
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+      "size": 1688573
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+      "name": "zlib",
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+      "size": 886451
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+      "name": "wcwidth",
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+      "version": "0.6.0",
+      "subdir": "noarch",
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+      "size": 71550
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+      "name": "asttokens",
+      "build": "pyhd8ed1ab_0",
+      "version": "3.0.1",
+      "subdir": "noarch",
+      "channel": "conda-forge",
+      "hash": {
+        "md5": "9673a61a297b00016442e022d689faa6",
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+      "name": "executing",
+      "build": "pyhd8ed1ab_0",
+      "version": "2.2.1",
+      "subdir": "noarch",
+      "channel": "conda-forge",
+      "hash": {
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+        "sha256": "210c8165a58fdbf16e626aac93cc4c14dbd551a01d1516be5ecad795d2422cad"
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+    "pure_eval-0.2.3-pyhd8ed1ab_1.conda": {
+      "name": "pure_eval",
+      "build": "pyhd8ed1ab_1",
+      "version": "0.2.3",
+      "subdir": "noarch",
+      "channel": "conda-forge",
+      "hash": {
+        "md5": "3bfdfb8dbcdc4af1ae3f9a8eb3948f04",
+        "sha256": "71bd24600d14bb171a6321d523486f6a06f855e75e547fa0cb2a0953b02047f0"
+      },
+      "size": 16668
+    },
+    "ptyprocess-0.7.0-pyhd8ed1ab_1.conda": {
+      "name": "ptyprocess",
+      "build": "pyhd8ed1ab_1",
+      "version": "0.7.0",
+      "subdir": "noarch",
+      "channel": "conda-forge",
+      "hash": {
+        "md5": "7d9daffbb8d8e0af0f769dbbcd173a54",
+        "sha256": "a7713dfe30faf17508ec359e0bc7e0983f5d94682492469bd462cdaae9c64d83"
+      },
+      "size": 19457
+    },
+    "six-1.17.0-pyhe01879c_1.conda": {
+      "name": "six",
+      "build": "pyhe01879c_1",
+      "version": "1.17.0",
+      "subdir": "noarch",
+      "channel": "conda-forge",
+      "hash": {
+        "md5": "3339e3b65d58accf4ca4fb8748ab16b3",
+        "sha256": "458227f759d5e3fcec5d9b7acce54e10c9e1f4f4b7ec978f3bfd54ce4ee9853d"
+      },
+      "size": 18455
+    }
+  },
+  "pipPackages": {}
+}
\ No newline at end of file
diff --git a/notebooks_en/1_Catch_Motion.ipynb b/notebooks_en/1_Catch_Motion.ipynb
index 1b3c410..23598a0 100644
--- a/notebooks_en/1_Catch_Motion.ipynb
+++ b/notebooks_en/1_Catch_Motion.ipynb
@@ -88,7 +88,6 @@
     "urlretrieve(video_url, fname)\n",
     "```\n",
     "</br>\n",
-    "\n",
     "We assume here that you downloaded the video, and you will read it from its local file name. Check the type, and note that you can get info, like the frames-per-second, using `get_meta_data()`. This function returns a dictionary, so to access one data element you would use the key (for example `'fps'` is the key for the data about frames per second)."
    ]
   },
@@ -5358,252 +5357,6 @@
     "\n",
     "3. _Elementary Mechanics Using Python_ (2015), Anders Malthe-Sorenssen, Undergraduate Lecture Notes in Physics, Springer. Data at https://folk.universitetetioslo.no/malthe/mechbook/fallingtennisball02.d"
    ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 1,
-   "metadata": {},
-   "outputs": [
-    {
-     "data": {
-      "text/html": [
-       "<style>\n",
-       "\n",
-       "@font-face {\n",
-       "    font-family: 'et-book';\n",
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-       "         url('https://cdnjs.cloudflare.com/ajax/libs/tufte-css/1.8.0/et-book/et-book-roman-line-figures/et-book-roman-line-figures.woff') format('woff');\n",
-       "    font-weight: normal;\n",
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-       "@font-face {\n",
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-       "} \n",
-       "\n",
-       ".jp-RenderedHTMLCommon {\n",
-       "    line-height: 1.3 !important;\n",
-       "    font-size: 20px !important;\n",
-       "    font-family: 'et-book', 'Palatino Linotype', Palatino, serif;\n",
-       "    padding-left: 10% !important;\n",
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-       "\n",
-       "code {\n",
-       "    font-size: 0.8em !important;\n",
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-       "\n",
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-       "    background: #000;\n",
-       "    height: 1px;\n",
-       "    border: 0px;\n",
-       "} \n",
-       "\n",
-       "\n",
-       "#notebook_panel { /* main background */\n",
-       "    background: rgb(245,245,245);\n",
-       "}\n",
-       "\n",
-       "div.cell { /* set cell width */\n",
-       "    width: 800px;\n",
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-       "\n",
-       "div #notebook { /* centre the content */\n",
-       "    background: #fff; /* white background for content */\n",
-       "    width: 800px;\n",
-       "    margin: auto;\n",
-       "    padding-left: 0em;\n",
-       "}\n",
-       "\n",
-       "#notebook li { /* More space between bullet points */\n",
-       "margin-top:0.5em;\n",
-       "}\n",
-       "\n",
-       "/* draw border around running cells */\n",
-       "div.cell.border-box-sizing.code_cell.running { \n",
-       "    border: 1px solid #111;\n",
-       "}\n",
-       "\n",
-       "/* Put a solid color box around each cell and its output, visually linking them*/\n",
-       "div.cell.code_cell {\n",
-       "    background-color: rgb(256,256,256); \n",
-       "    border-radius: 0px; \n",
-       "    padding: 0.5em;\n",
-       "    margin-left:1em;\n",
-       "    margin-top: 1em;\n",
-       "}\n",
-       "\n",
-       "\n",
-       "div.text_cell_render{\n",
-       "    font-family: 'Source Sans', sans-serif;\n",
-       "    line-height: 140%;\n",
-       "    font-size: 100%;\n",
-       "    width:680px;\n",
-       "    margin-left:auto;\n",
-       "    margin-right:auto;\n",
-       "}\n",
-       "\n",
-       "/* Formatting for header cells */\n",
-       ".text_cell_render h1 {\n",
-       "    /* font-family: 'Merriweather', serif; */\n",
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-       "    margin-bottom: 2em;\n",
-       "    margin-left: 80pt;\n",
-       "    font-style: italic;\n",
-       "}\n",
-       "\n",
-       ".text_cell_render h5 {  /*Use this for small titles*/\n",
-       "    font-family: 'Source Sans', sans-serif;\n",
-       "    font-size: 130%;\n",
-       "    color: #e31937;\n",
-       "    margin-bottom: .5em;\n",
-       "    margin-top: 1em;\n",
-       "    display: block;\n",
-       "}\n",
-       "\n",
-       ".text_cell_render h6 { /*use this for copyright note*/\n",
-       "    font-family: 'Source Code Pro', sans-serif;\n",
-       "    font-weight: 300;\n",
-       "    font-size: 9pt;\n",
-       "    line-height: 100%;\n",
-       "    color: grey;\n",
-       "    margin-bottom: 1px;\n",
-       "    margin-top: 1px;\n",
-       "}\n",
-       "\n",
-       "    .CodeMirror{\n",
-       "            font-family: \"Source Code Pro\";\n",
-       "\t\t\tfont-size: 100%;\n",
-       "    }\n",
-       "/*    .prompt{\n",
-       "        display: None;\n",
-       "    }*/\n",
-       "\t\n",
-       "    \n",
-       "    .warning{\n",
-       "        color: rgb( 240, 20, 20 )\n",
-       "        }  \n",
-       "</style>\n",
-       "<script>\n",
-       "    MathJax.Hub.Config({\n",
-       "                        TeX: {\n",
-       "                           extensions: [\"AMSmath.js\"], \n",
-       "                           equationNumbers: { autoNumber: \"AMS\", useLabelIds: true}\n",
-       "                           },\n",
-       "                tex2jax: {\n",
-       "                    inlineMath: [ ['$','$'], [\"\\\\(\",\"\\\\)\"] ],\n",
-       "                    displayMath: [ ['$$','$$'], [\"\\\\[\",\"\\\\]\"] ]\n",
-       "                },\n",
-       "                displayAlign: 'center', // Change this to 'center' to center equations.\n",
-       "                \"HTML-CSS\": {\n",
-       "                    styles: {'.MathJax_Display': {\"margin\": 4}}\n",
-       "                }\n",
-       "        });\n",
-       "</script>\n"
-      ],
-      "text/plain": [
-       "<IPython.core.display.HTML object>"
-      ]
-     },
-     "execution_count": 1,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
-   "source": [
-    "# Execute this cell to load the notebook's style sheet, then ignore it\n",
-    "from IPython.core.display import HTML\n",
-    "css_file = '../../../styles/custom.css'\n",
-    "HTML(open(css_file, \"r\").read())"
-   ]
   }
  ],
  "metadata": {
@@ -5622,7 +5375,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.11.9"
+   "version": "3.14.3"
   }
  },
  "nbformat": 4,
diff --git a/notebooks_en/2_Step_Future.ipynb b/notebooks_en/2_Step_Future.ipynb
index 084ba6a..6354c10 100644
--- a/notebooks_en/2_Step_Future.ipynb
+++ b/notebooks_en/2_Step_Future.ipynb
@@ -891,252 +891,6 @@
     "\n",
     "4. _Computational Physics with Python_, lecture notes by Eric Ayars, California State University, Chico. Available online on the author's website: https://physics.csuchico.edu/ayars/312/handouts/comp-phys-python.pdf"
    ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 1,
-   "metadata": {},
-   "outputs": [
-    {
-     "data": {
-      "text/html": [
-       "<style>\n",
-       "\n",
-       "@font-face {\n",
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-       "    --jp-content-font-scale-factor: 1.2;\n",
-       "    --jp-content-font-size1: 20px; /* Base font size */\n",
-       "    --jp-content-font-family: 'et-book', 'Palatino Linotype', Palatino, serif;\n",
-       "} \n",
-       "\n",
-       ".jp-RenderedHTMLCommon {\n",
-       "    line-height: 1.3 !important;\n",
-       "    font-size: 20px !important;\n",
-       "    font-family: 'et-book', 'Palatino Linotype', Palatino, serif;\n",
-       "    padding-left: 10% !important;\n",
-       "    padding-right: 20% !important;\n",
-       "}\n",
-       "\n",
-       ".jp-CodeCell {\n",
-       "    padding-left: 10% !important;\n",
-       "    padding-right: 20% !important;\n",
-       "}\n",
-       "\n",
-       ".jp-RawCell {\n",
-       "    padding-left: 10% !important;\n",
-       "    padding-right: 20% !important;\n",
-       "}\n",
-       "\n",
-       "\n",
-       "code {\n",
-       "    font-size: 0.8em !important;\n",
-       "    background-color: #f0f0f0 !important;\n",
-       "}\n",
-       "\n",
-       "hr {\n",
-       "    background: #000;\n",
-       "    height: 1px;\n",
-       "    border: 0px;\n",
-       "} \n",
-       "\n",
-       "\n",
-       "#notebook_panel { /* main background */\n",
-       "    background: rgb(245,245,245);\n",
-       "}\n",
-       "\n",
-       "div.cell { /* set cell width */\n",
-       "    width: 800px;\n",
-       "}\n",
-       "\n",
-       "div #notebook { /* centre the content */\n",
-       "    background: #fff; /* white background for content */\n",
-       "    width: 800px;\n",
-       "    margin: auto;\n",
-       "    padding-left: 0em;\n",
-       "}\n",
-       "\n",
-       "#notebook li { /* More space between bullet points */\n",
-       "margin-top:0.5em;\n",
-       "}\n",
-       "\n",
-       "/* draw border around running cells */\n",
-       "div.cell.border-box-sizing.code_cell.running { \n",
-       "    border: 1px solid #111;\n",
-       "}\n",
-       "\n",
-       "/* Put a solid color box around each cell and its output, visually linking them*/\n",
-       "div.cell.code_cell {\n",
-       "    background-color: rgb(256,256,256); \n",
-       "    border-radius: 0px; \n",
-       "    padding: 0.5em;\n",
-       "    margin-left:1em;\n",
-       "    margin-top: 1em;\n",
-       "}\n",
-       "\n",
-       "\n",
-       "div.text_cell_render{\n",
-       "    font-family: 'Source Sans', sans-serif;\n",
-       "    line-height: 140%;\n",
-       "    font-size: 100%;\n",
-       "    width:680px;\n",
-       "    margin-left:auto;\n",
-       "    margin-right:auto;\n",
-       "}\n",
-       "\n",
-       "/* Formatting for header cells */\n",
-       ".text_cell_render h1 {\n",
-       "    /* font-family: 'Merriweather', serif; */\n",
-       "    font-style:regular;\n",
-       "    font-weight: bold;    \n",
-       "    font-size: 250%;\n",
-       "    line-height: 100%;\n",
-       "    color: #004065;\n",
-       "    margin-bottom: 1em;\n",
-       "    margin-top: 0.5em;\n",
-       "    display: block;\n",
-       "}\t\n",
-       ".text_cell_render h2 {\n",
-       "    /* font-family: 'Merriweather', serif; */\n",
-       "    font-weight: bold; \n",
-       "    font-size: 180%;\n",
-       "    line-height: 100%;\n",
-       "    color: #0096d6;\n",
-       "    margin-bottom: 0.5em;\n",
-       "    margin-top: 0.5em;\n",
-       "    display: block;\n",
-       "}\t\n",
-       "\n",
-       ".text_cell_render h3 {\n",
-       "    /* font-family: 'Merriweather', serif; */\n",
-       "\tfont-size: 150%;\n",
-       "    margin-top:12px;\n",
-       "    margin-bottom: 3px;\n",
-       "    font-style: regular;\n",
-       "    color: #008367;\n",
-       "}\n",
-       "\n",
-       ".text_cell_render h4 {    /*Use this for captions*/\n",
-       "    font-family: 'et-book';\n",
-       "    font-weight: 300; \n",
-       "    font-size: 100%;\n",
-       "    line-height: 120%;\n",
-       "    text-align: left;\n",
-       "    width:500px;\n",
-       "    margin-top: 1em;\n",
-       "    margin-bottom: 2em;\n",
-       "    margin-left: 80pt;\n",
-       "    font-style: italic;\n",
-       "}\n",
-       "\n",
-       ".text_cell_render h5 {  /*Use this for small titles*/\n",
-       "    font-family: 'Source Sans', sans-serif;\n",
-       "    font-size: 130%;\n",
-       "    color: #e31937;\n",
-       "    margin-bottom: .5em;\n",
-       "    margin-top: 1em;\n",
-       "    display: block;\n",
-       "}\n",
-       "\n",
-       ".text_cell_render h6 { /*use this for copyright note*/\n",
-       "    font-family: 'Source Code Pro', sans-serif;\n",
-       "    font-weight: 300;\n",
-       "    font-size: 9pt;\n",
-       "    line-height: 100%;\n",
-       "    color: grey;\n",
-       "    margin-bottom: 1px;\n",
-       "    margin-top: 1px;\n",
-       "}\n",
-       "\n",
-       "    .CodeMirror{\n",
-       "            font-family: \"Source Code Pro\";\n",
-       "\t\t\tfont-size: 100%;\n",
-       "    }\n",
-       "/*    .prompt{\n",
-       "        display: None;\n",
-       "    }*/\n",
-       "\t\n",
-       "    \n",
-       "    .warning{\n",
-       "        color: rgb( 240, 20, 20 )\n",
-       "        }  \n",
-       "</style>\n",
-       "<script>\n",
-       "    MathJax.Hub.Config({\n",
-       "                        TeX: {\n",
-       "                           extensions: [\"AMSmath.js\"], \n",
-       "                           equationNumbers: { autoNumber: \"AMS\", useLabelIds: true}\n",
-       "                           },\n",
-       "                tex2jax: {\n",
-       "                    inlineMath: [ ['$','$'], [\"\\\\(\",\"\\\\)\"] ],\n",
-       "                    displayMath: [ ['$$','$$'], [\"\\\\[\",\"\\\\]\"] ]\n",
-       "                },\n",
-       "                displayAlign: 'center', // Change this to 'center' to center equations.\n",
-       "                \"HTML-CSS\": {\n",
-       "                    styles: {'.MathJax_Display': {\"margin\": 4}}\n",
-       "                }\n",
-       "        });\n",
-       "</script>\n"
-      ],
-      "text/plain": [
-       "<IPython.core.display.HTML object>"
-      ]
-     },
-     "execution_count": 1,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
-   "source": [
-    "# Execute this cell to load the notebook's style sheet, then ignore it\n",
-    "from IPython.core.display import HTML\n",
-    "css_file = '../../../styles/custom.css'\n",
-    "HTML(open(css_file, \"r\").read())"
-   ]
   }
  ],
  "metadata": {
@@ -1155,7 +909,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.11.9"
+   "version": "3.14.3"
   }
  },
  "nbformat": 4,
diff --git a/notebooks_en/3_Get_Oscillations.ipynb b/notebooks_en/3_Get_Oscillations.ipynb
index 9906a08..4fdf458 100644
--- a/notebooks_en/3_Get_Oscillations.ipynb
+++ b/notebooks_en/3_Get_Oscillations.ipynb
@@ -940,252 +940,6 @@
     "\n",
     "2. Cromer, A. (1981). Stable solutions using the Euler approximation. _American Journal of Physics_, 49(5), 455-459. https://doi.org/10.1119/1.12478\n"
    ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 1,
-   "metadata": {},
-   "outputs": [
-    {
-     "data": {
-      "text/html": [
-       "<style>\n",
-       "\n",
-       "@font-face {\n",
-       "    font-family: 'et-book';\n",
-       "    src: url('https://cdnjs.cloudflare.com/ajax/libs/tufte-css/1.8.0/et-book/et-book-roman-line-figures/et-book-roman-line-figures.woff') format('woff2'),\n",
-       "         url('https://cdnjs.cloudflare.com/ajax/libs/tufte-css/1.8.0/et-book/et-book-roman-line-figures/et-book-roman-line-figures.woff') format('woff');\n",
-       "    font-weight: normal;\n",
-       "    font-style: normal;\n",
-       "}\n",
-       "@font-face {\n",
-       "    font-family: 'et-book';\n",
-       "    src: url('https://cdnjs.cloudflare.com/ajax/libs/tufte-css/1.8.0/et-book/et-book-display-italic-old-style-figures/et-book-display-italic-old-style-figures.woff') format('woff');\n",
-       "    font-weight: normal;\n",
-       "    font-style: italic;\n",
-       "}\n",
-       "@font-face {\n",
-       "    font-family: 'et-book';\n",
-       "    src: url('https://cdnjs.cloudflare.com/ajax/libs/tufte-css/1.8.0/et-book/et-book-bold-line-figures/et-book-bold-line-figures.woff') format('woff');\n",
-       "    font-weight: bold;\n",
-       "    font-style: normal;\n",
-       "}\n",
-       "/* The various ET-Book fonts are on GitHub at: https://github.com/edwardtufte/et-book\n",
-       "*/\n",
-       "@font-face{\n",
-       "    font-family: 'Source Code Pro';\n",
-       "    font-weight: 400;\n",
-       "    font-style: normal;\n",
-       "    font-stretch: normal;\n",
-       "    src: url('https://raw.githubusercontent.com/adobe-fonts/source-code-pro/release/WOFF2/OTF/SourceCodePro-Regular.otf.woff2') format('woff2'),\n",
-       "         url('https://raw.githubusercontent.com/adobe-fonts/source-code-pro/release/WOFF/OTF/SourceCodePro-Regular.otf.woff') format('woff'),\n",
-       "         url('https://raw.githubusercontent.com/adobe-fonts/source-code-pro/release/OTF/SourceCodePro-Regular.otf') format('opentype');\n",
-       "}\n",
-       "\n",
-       "@font-face{\n",
-       "    font-family: 'Source Sans';\n",
-       "    font-weight: 400;\n",
-       "    font-style: normal;\n",
-       "    font-stretch: normal;\n",
-       "    src: url('https://raw.githubusercontent.com/adobe-fonts/source-sans/release/WOFF2/OTF/SourceSans3-Regular.otf.woff2') format('woff2'),\n",
-       "         url('https://raw.githubusercontent.com/adobe-fonts/source-sans/release/WOFF/OTF/SourceSans3-Regular.otf.woff') format('woff'),\n",
-       "         url('https://raw.githubusercontent.com/adobe-fonts/source-sans/release/OTF/SourceSans3-Regular.otf') format('opentype');\n",
-       "}\n",
-       "@font-face {\n",
-       "    font-family: \"Computer Modern\";\n",
-       "    src: url('http://mirrors.ctan.org/fonts/cm-unicode/fonts/otf/cmunss.otf');\n",
-       "}\n",
-       "\n",
-       ":root {\n",
-       "    --jp-content-line-height: 1.3;\n",
-       "    --jp-content-font-scale-factor: 1.2;\n",
-       "    --jp-content-font-size1: 20px; /* Base font size */\n",
-       "    --jp-content-font-family: 'et-book', 'Palatino Linotype', Palatino, serif;\n",
-       "} \n",
-       "\n",
-       ".jp-RenderedHTMLCommon {\n",
-       "    line-height: 1.3 !important;\n",
-       "    font-size: 20px !important;\n",
-       "    font-family: 'et-book', 'Palatino Linotype', Palatino, serif;\n",
-       "    padding-left: 10% !important;\n",
-       "    padding-right: 20% !important;\n",
-       "}\n",
-       "\n",
-       ".jp-CodeCell {\n",
-       "    padding-left: 10% !important;\n",
-       "    padding-right: 20% !important;\n",
-       "}\n",
-       "\n",
-       ".jp-RawCell {\n",
-       "    padding-left: 10% !important;\n",
-       "    padding-right: 20% !important;\n",
-       "}\n",
-       "\n",
-       "\n",
-       "code {\n",
-       "    font-size: 0.8em !important;\n",
-       "    background-color: #f0f0f0 !important;\n",
-       "}\n",
-       "\n",
-       "hr {\n",
-       "    background: #000;\n",
-       "    height: 1px;\n",
-       "    border: 0px;\n",
-       "} \n",
-       "\n",
-       "\n",
-       "#notebook_panel { /* main background */\n",
-       "    background: rgb(245,245,245);\n",
-       "}\n",
-       "\n",
-       "div.cell { /* set cell width */\n",
-       "    width: 800px;\n",
-       "}\n",
-       "\n",
-       "div #notebook { /* centre the content */\n",
-       "    background: #fff; /* white background for content */\n",
-       "    width: 800px;\n",
-       "    margin: auto;\n",
-       "    padding-left: 0em;\n",
-       "}\n",
-       "\n",
-       "#notebook li { /* More space between bullet points */\n",
-       "margin-top:0.5em;\n",
-       "}\n",
-       "\n",
-       "/* draw border around running cells */\n",
-       "div.cell.border-box-sizing.code_cell.running { \n",
-       "    border: 1px solid #111;\n",
-       "}\n",
-       "\n",
-       "/* Put a solid color box around each cell and its output, visually linking them*/\n",
-       "div.cell.code_cell {\n",
-       "    background-color: rgb(256,256,256); \n",
-       "    border-radius: 0px; \n",
-       "    padding: 0.5em;\n",
-       "    margin-left:1em;\n",
-       "    margin-top: 1em;\n",
-       "}\n",
-       "\n",
-       "\n",
-       "div.text_cell_render{\n",
-       "    font-family: 'Source Sans', sans-serif;\n",
-       "    line-height: 140%;\n",
-       "    font-size: 100%;\n",
-       "    width:680px;\n",
-       "    margin-left:auto;\n",
-       "    margin-right:auto;\n",
-       "}\n",
-       "\n",
-       "/* Formatting for header cells */\n",
-       ".text_cell_render h1 {\n",
-       "    /* font-family: 'Merriweather', serif; */\n",
-       "    font-style:regular;\n",
-       "    font-weight: bold;    \n",
-       "    font-size: 250%;\n",
-       "    line-height: 100%;\n",
-       "    color: #004065;\n",
-       "    margin-bottom: 1em;\n",
-       "    margin-top: 0.5em;\n",
-       "    display: block;\n",
-       "}\t\n",
-       ".text_cell_render h2 {\n",
-       "    /* font-family: 'Merriweather', serif; */\n",
-       "    font-weight: bold; \n",
-       "    font-size: 180%;\n",
-       "    line-height: 100%;\n",
-       "    color: #0096d6;\n",
-       "    margin-bottom: 0.5em;\n",
-       "    margin-top: 0.5em;\n",
-       "    display: block;\n",
-       "}\t\n",
-       "\n",
-       ".text_cell_render h3 {\n",
-       "    /* font-family: 'Merriweather', serif; */\n",
-       "\tfont-size: 150%;\n",
-       "    margin-top:12px;\n",
-       "    margin-bottom: 3px;\n",
-       "    font-style: regular;\n",
-       "    color: #008367;\n",
-       "}\n",
-       "\n",
-       ".text_cell_render h4 {    /*Use this for captions*/\n",
-       "    font-family: 'et-book';\n",
-       "    font-weight: 300; \n",
-       "    font-size: 100%;\n",
-       "    line-height: 120%;\n",
-       "    text-align: left;\n",
-       "    width:500px;\n",
-       "    margin-top: 1em;\n",
-       "    margin-bottom: 2em;\n",
-       "    margin-left: 80pt;\n",
-       "    font-style: italic;\n",
-       "}\n",
-       "\n",
-       ".text_cell_render h5 {  /*Use this for small titles*/\n",
-       "    font-family: 'Source Sans', sans-serif;\n",
-       "    font-size: 130%;\n",
-       "    color: #e31937;\n",
-       "    margin-bottom: .5em;\n",
-       "    margin-top: 1em;\n",
-       "    display: block;\n",
-       "}\n",
-       "\n",
-       ".text_cell_render h6 { /*use this for copyright note*/\n",
-       "    font-family: 'Source Code Pro', sans-serif;\n",
-       "    font-weight: 300;\n",
-       "    font-size: 9pt;\n",
-       "    line-height: 100%;\n",
-       "    color: grey;\n",
-       "    margin-bottom: 1px;\n",
-       "    margin-top: 1px;\n",
-       "}\n",
-       "\n",
-       "    .CodeMirror{\n",
-       "            font-family: \"Source Code Pro\";\n",
-       "\t\t\tfont-size: 100%;\n",
-       "    }\n",
-       "/*    .prompt{\n",
-       "        display: None;\n",
-       "    }*/\n",
-       "\t\n",
-       "    \n",
-       "    .warning{\n",
-       "        color: rgb( 240, 20, 20 )\n",
-       "        }  \n",
-       "</style>\n",
-       "<script>\n",
-       "    MathJax.Hub.Config({\n",
-       "                        TeX: {\n",
-       "                           extensions: [\"AMSmath.js\"], \n",
-       "                           equationNumbers: { autoNumber: \"AMS\", useLabelIds: true}\n",
-       "                           },\n",
-       "                tex2jax: {\n",
-       "                    inlineMath: [ ['$','$'], [\"\\\\(\",\"\\\\)\"] ],\n",
-       "                    displayMath: [ ['$$','$$'], [\"\\\\[\",\"\\\\]\"] ]\n",
-       "                },\n",
-       "                displayAlign: 'center', // Change this to 'center' to center equations.\n",
-       "                \"HTML-CSS\": {\n",
-       "                    styles: {'.MathJax_Display': {\"margin\": 4}}\n",
-       "                }\n",
-       "        });\n",
-       "</script>\n"
-      ],
-      "text/plain": [
-       "<IPython.core.display.HTML object>"
-      ]
-     },
-     "execution_count": 1,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
-   "source": [
-    "# Execute this cell to load the notebook's style sheet, then ignore it\n",
-    "from IPython.core.display import HTML\n",
-    "css_file = '../../../styles/custom.css'\n",
-    "HTML(open(css_file, \"r\").read())"
-   ]
   }
  ],
  "metadata": {
@@ -1204,7 +958,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.13.5"
+   "version": "3.14.3"
   }
  },
  "nbformat": 4,
diff --git a/notebooks_en/4_Birdseye_Vibrations.ipynb b/notebooks_en/4_Birdseye_Vibrations.ipynb
index 430f19e..95070e7 100644
--- a/notebooks_en/4_Birdseye_Vibrations.ipynb
+++ b/notebooks_en/4_Birdseye_Vibrations.ipynb
@@ -39,7 +39,7 @@
     "from matplotlib import pyplot\n",
     "%matplotlib inline\n",
     "pyplot.rc('font', family='serif', size='14')\n",
-    "pyplot.rcParams['text.usetex'] = True # Enable LaTeX rendering"
+    "# pyplot.rcParams['text.usetex'] = True # Enable LaTeX rendering"
    ]
   },
   {
@@ -1026,252 +1026,6 @@
     "V\n",
     "2. [Plotting direction fields and trajectories in the phase plane](http://scipy-cookbook.readthedocs.io/items/LoktaVolterraTutorial.html?highlight=direction%20fields#Plotting-direction-fields-and-trajectories-in-the-phase-plane), as part of the Lotka-Volterra tutorial by Pauli Virtanen and Bhupendra, in the _SciPy Cookbook_. "
    ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 1,
-   "metadata": {},
-   "outputs": [
-    {
-     "data": {
-      "text/html": [
-       "<style>\n",
-       "\n",
-       "@font-face {\n",
-       "    font-family: 'et-book';\n",
-       "    src: url('https://cdnjs.cloudflare.com/ajax/libs/tufte-css/1.8.0/et-book/et-book-roman-line-figures/et-book-roman-line-figures.woff') format('woff2'),\n",
-       "         url('https://cdnjs.cloudflare.com/ajax/libs/tufte-css/1.8.0/et-book/et-book-roman-line-figures/et-book-roman-line-figures.woff') format('woff');\n",
-       "    font-weight: normal;\n",
-       "    font-style: normal;\n",
-       "}\n",
-       "@font-face {\n",
-       "    font-family: 'et-book';\n",
-       "    src: url('https://cdnjs.cloudflare.com/ajax/libs/tufte-css/1.8.0/et-book/et-book-display-italic-old-style-figures/et-book-display-italic-old-style-figures.woff') format('woff');\n",
-       "    font-weight: normal;\n",
-       "    font-style: italic;\n",
-       "}\n",
-       "@font-face {\n",
-       "    font-family: 'et-book';\n",
-       "    src: url('https://cdnjs.cloudflare.com/ajax/libs/tufte-css/1.8.0/et-book/et-book-bold-line-figures/et-book-bold-line-figures.woff') format('woff');\n",
-       "    font-weight: bold;\n",
-       "    font-style: normal;\n",
-       "}\n",
-       "/* The various ET-Book fonts are on GitHub at: https://github.com/edwardtufte/et-book\n",
-       "*/\n",
-       "@font-face{\n",
-       "    font-family: 'Source Code Pro';\n",
-       "    font-weight: 400;\n",
-       "    font-style: normal;\n",
-       "    font-stretch: normal;\n",
-       "    src: url('https://raw.githubusercontent.com/adobe-fonts/source-code-pro/release/WOFF2/OTF/SourceCodePro-Regular.otf.woff2') format('woff2'),\n",
-       "         url('https://raw.githubusercontent.com/adobe-fonts/source-code-pro/release/WOFF/OTF/SourceCodePro-Regular.otf.woff') format('woff'),\n",
-       "         url('https://raw.githubusercontent.com/adobe-fonts/source-code-pro/release/OTF/SourceCodePro-Regular.otf') format('opentype');\n",
-       "}\n",
-       "\n",
-       "@font-face{\n",
-       "    font-family: 'Source Sans';\n",
-       "    font-weight: 400;\n",
-       "    font-style: normal;\n",
-       "    font-stretch: normal;\n",
-       "    src: url('https://raw.githubusercontent.com/adobe-fonts/source-sans/release/WOFF2/OTF/SourceSans3-Regular.otf.woff2') format('woff2'),\n",
-       "         url('https://raw.githubusercontent.com/adobe-fonts/source-sans/release/WOFF/OTF/SourceSans3-Regular.otf.woff') format('woff'),\n",
-       "         url('https://raw.githubusercontent.com/adobe-fonts/source-sans/release/OTF/SourceSans3-Regular.otf') format('opentype');\n",
-       "}\n",
-       "@font-face {\n",
-       "    font-family: \"Computer Modern\";\n",
-       "    src: url('http://mirrors.ctan.org/fonts/cm-unicode/fonts/otf/cmunss.otf');\n",
-       "}\n",
-       "\n",
-       ":root {\n",
-       "    --jp-content-line-height: 1.3;\n",
-       "    --jp-content-font-scale-factor: 1.2;\n",
-       "    --jp-content-font-size1: 20px; /* Base font size */\n",
-       "    --jp-content-font-family: 'et-book', 'Palatino Linotype', Palatino, serif;\n",
-       "} \n",
-       "\n",
-       ".jp-RenderedHTMLCommon {\n",
-       "    line-height: 1.3 !important;\n",
-       "    font-size: 20px !important;\n",
-       "    font-family: 'et-book', 'Palatino Linotype', Palatino, serif;\n",
-       "    padding-left: 10% !important;\n",
-       "    padding-right: 20% !important;\n",
-       "}\n",
-       "\n",
-       ".jp-CodeCell {\n",
-       "    padding-left: 10% !important;\n",
-       "    padding-right: 20% !important;\n",
-       "}\n",
-       "\n",
-       ".jp-RawCell {\n",
-       "    padding-left: 10% !important;\n",
-       "    padding-right: 20% !important;\n",
-       "}\n",
-       "\n",
-       "\n",
-       "code {\n",
-       "    font-size: 0.8em !important;\n",
-       "    background-color: #f0f0f0 !important;\n",
-       "}\n",
-       "\n",
-       "hr {\n",
-       "    background: #000;\n",
-       "    height: 1px;\n",
-       "    border: 0px;\n",
-       "} \n",
-       "\n",
-       "\n",
-       "#notebook_panel { /* main background */\n",
-       "    background: rgb(245,245,245);\n",
-       "}\n",
-       "\n",
-       "div.cell { /* set cell width */\n",
-       "    width: 800px;\n",
-       "}\n",
-       "\n",
-       "div #notebook { /* centre the content */\n",
-       "    background: #fff; /* white background for content */\n",
-       "    width: 800px;\n",
-       "    margin: auto;\n",
-       "    padding-left: 0em;\n",
-       "}\n",
-       "\n",
-       "#notebook li { /* More space between bullet points */\n",
-       "margin-top:0.5em;\n",
-       "}\n",
-       "\n",
-       "/* draw border around running cells */\n",
-       "div.cell.border-box-sizing.code_cell.running { \n",
-       "    border: 1px solid #111;\n",
-       "}\n",
-       "\n",
-       "/* Put a solid color box around each cell and its output, visually linking them*/\n",
-       "div.cell.code_cell {\n",
-       "    background-color: rgb(256,256,256); \n",
-       "    border-radius: 0px; \n",
-       "    padding: 0.5em;\n",
-       "    margin-left:1em;\n",
-       "    margin-top: 1em;\n",
-       "}\n",
-       "\n",
-       "\n",
-       "div.text_cell_render{\n",
-       "    font-family: 'Source Sans', sans-serif;\n",
-       "    line-height: 140%;\n",
-       "    font-size: 100%;\n",
-       "    width:680px;\n",
-       "    margin-left:auto;\n",
-       "    margin-right:auto;\n",
-       "}\n",
-       "\n",
-       "/* Formatting for header cells */\n",
-       ".text_cell_render h1 {\n",
-       "    /* font-family: 'Merriweather', serif; */\n",
-       "    font-style:regular;\n",
-       "    font-weight: bold;    \n",
-       "    font-size: 250%;\n",
-       "    line-height: 100%;\n",
-       "    color: #004065;\n",
-       "    margin-bottom: 1em;\n",
-       "    margin-top: 0.5em;\n",
-       "    display: block;\n",
-       "}\t\n",
-       ".text_cell_render h2 {\n",
-       "    /* font-family: 'Merriweather', serif; */\n",
-       "    font-weight: bold; \n",
-       "    font-size: 180%;\n",
-       "    line-height: 100%;\n",
-       "    color: #0096d6;\n",
-       "    margin-bottom: 0.5em;\n",
-       "    margin-top: 0.5em;\n",
-       "    display: block;\n",
-       "}\t\n",
-       "\n",
-       ".text_cell_render h3 {\n",
-       "    /* font-family: 'Merriweather', serif; */\n",
-       "\tfont-size: 150%;\n",
-       "    margin-top:12px;\n",
-       "    margin-bottom: 3px;\n",
-       "    font-style: regular;\n",
-       "    color: #008367;\n",
-       "}\n",
-       "\n",
-       ".text_cell_render h4 {    /*Use this for captions*/\n",
-       "    font-family: 'et-book';\n",
-       "    font-weight: 300; \n",
-       "    font-size: 100%;\n",
-       "    line-height: 120%;\n",
-       "    text-align: left;\n",
-       "    width:500px;\n",
-       "    margin-top: 1em;\n",
-       "    margin-bottom: 2em;\n",
-       "    margin-left: 80pt;\n",
-       "    font-style: italic;\n",
-       "}\n",
-       "\n",
-       ".text_cell_render h5 {  /*Use this for small titles*/\n",
-       "    font-family: 'Source Sans', sans-serif;\n",
-       "    font-size: 130%;\n",
-       "    color: #e31937;\n",
-       "    margin-bottom: .5em;\n",
-       "    margin-top: 1em;\n",
-       "    display: block;\n",
-       "}\n",
-       "\n",
-       ".text_cell_render h6 { /*use this for copyright note*/\n",
-       "    font-family: 'Source Code Pro', sans-serif;\n",
-       "    font-weight: 300;\n",
-       "    font-size: 9pt;\n",
-       "    line-height: 100%;\n",
-       "    color: grey;\n",
-       "    margin-bottom: 1px;\n",
-       "    margin-top: 1px;\n",
-       "}\n",
-       "\n",
-       "    .CodeMirror{\n",
-       "            font-family: \"Source Code Pro\";\n",
-       "\t\t\tfont-size: 100%;\n",
-       "    }\n",
-       "/*    .prompt{\n",
-       "        display: None;\n",
-       "    }*/\n",
-       "\t\n",
-       "    \n",
-       "    .warning{\n",
-       "        color: rgb( 240, 20, 20 )\n",
-       "        }  \n",
-       "</style>\n",
-       "<script>\n",
-       "    MathJax.Hub.Config({\n",
-       "                        TeX: {\n",
-       "                           extensions: [\"AMSmath.js\"], \n",
-       "                           equationNumbers: { autoNumber: \"AMS\", useLabelIds: true}\n",
-       "                           },\n",
-       "                tex2jax: {\n",
-       "                    inlineMath: [ ['$','$'], [\"\\\\(\",\"\\\\)\"] ],\n",
-       "                    displayMath: [ ['$$','$$'], [\"\\\\[\",\"\\\\]\"] ]\n",
-       "                },\n",
-       "                displayAlign: 'center', // Change this to 'center' to center equations.\n",
-       "                \"HTML-CSS\": {\n",
-       "                    styles: {'.MathJax_Display': {\"margin\": 4}}\n",
-       "                }\n",
-       "        });\n",
-       "</script>\n"
-      ],
-      "text/plain": [
-       "<IPython.core.display.HTML object>"
-      ]
-     },
-     "execution_count": 1,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
-   "source": [
-    "# Execute this cell to load the notebook's style sheet, then ignore it\n",
-    "from IPython.core.display import HTML\n",
-    "css_file = '../../../styles/custom.css'\n",
-    "HTML(open(css_file, \"r\").read())"
-   ]
   }
  ],
  "metadata": {
@@ -1290,7 +1044,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.13.5"
+   "version": "3.14.3"
   }
  },
  "nbformat": 4,