It is a nuissance having to add target region size, although it can simply and efficiently be calculated from the input target region file.
Merge overlapping regions (BAM reads are counted only once even when overlapping multiple target region features, consequently the size is effectively the size of the covered regions)
Calculate the total size of the regions covered by target regions.
It is a nuissance having to add target region size, although it can simply and efficiently be calculated from the input target region file.