: Signifies that the LD scores are provided per chromosome.
If you intended a different interpretation (e.g., it’s not a genetic file), please provide more context.
Why would a file like this use .tar.bz2 instead of the more modern .zip or .7z ? The answer lies in the culture of digital preservation.
The combination means we are looking at a bundle of files (a directory structure) that has been compressed tightly for storage or transfer. This is highly indicative of files meant for Linux/Unix environments or preservation archives where saving bytes is paramount.
