Remove PDF language from plot

[Sparks29032]

Not sure how I missed this.

Did another check of all rmin and rmax references, and the only one left is in the baseline slope estimation function. Since this is PDF-specific, I left it.

Someone else should check too though...

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.92%. Comparing base (4e9ef91) to head (df46a7e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #263   +/-   ##
=======================================
  Coverage   99.92%   99.92%           
=======================================
  Files          24       24           
  Lines        1398     1398           
=======================================
  Hits         1397     1397           
  Misses          1        1           

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