The longest archaic coverage tracts are preferentially found on chromosome X in our simulation studies.

Archaic coverage tract length spectra from a simulated autosome (blue) and chromosome X (orange). Each plot represents a combination of dominance (h = 0 or h = 0.5) and sex-bias (p = 0, p = 0.5, or p = 1, where p is the female fraction of the introgressors). Pie charts depict fraction of total coverage found on the autosome or chromosome X. Right pie shows coverage contained within the longest 1% of tracts; left pie shows all other coverage. Note that chromosomes have identical size and local recombination rates; see Methods. (TIF)