chrX_mean_dp and chrY_mean_dp

Dear colleague,

I am interested in a number of columns in the file "HGDP + 1KG callset

chr20_mean_dp: Sample’s mean depth across chromosome 20.
chrX_mean_dp: Sample’s mean depth across chromosome X.
chrY_mean_dp: Sample’s mean depth across chromosome Y.

I was wondering if you could help me understand how chr20_mean_dp,
chrX_mean_dp and chrY_mean_dp were calculated please? Is the Samtools
used for this calculation and what parameters are used?

For chrY_mean_dp, is “the whole chromosome Y” or “only the
male-specific region of the Y chromosome” used for the calculation?

For chrX_mean_dp, is “the whole chromosome X” or “only the region that
are unique to chromosome X” are used for the calculation?

Many thanks,

Best wishes,

Tom