Based on the file name pattern, this is likely one of the following:
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Because "406K" often refers to a large sample size (e.g., 406,000 individuals or variants), this file may be too large for standard text editors. 406K.txt
A list of samples that passed genotype calling. Troubleshooting
Often used to filter a "white British" subset or a specific cohort of ~406,000 participants. Based on the file name pattern, this is
If the file crashes your computer, use the chunksize parameter in Pandas to process it in smaller pieces.
Knowing the source (e.g., a specific research paper or database) would allow me to provide the exact column definitions and analysis steps. Troubleshooting Often used to filter a "white British"
If you see "garbled" text, try opening with encoding='utf-8' or encoding='ISO-8859-1' .