The PLINK file format is a well specified, storage efficient data type compatible with many bioinformatic software tools, which made it an obvious choice for Poseidon. The EIGENSTRAT format is also common within archaeogenetics, compatible with many of the important tools developed by the Reich Lab, e.g. the ones in the [EIGENSOFT](https://github.com/DReichLab/EIG) and [ADMIXTOOLS](https://github.com/DReichLab/AdmixTools). In the future even more formats might be supported (see e.g. [here](https://reich.hms.harvard.edu/software/InputFileFormats)).
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