Reference

Reading various files read .sam, .bed, .duplexgroup file
read_bed()	read .bed file
read_duplexgroup()	read .duplexgroup file
read_sam()	read .sam file
Genome coverage of reads
sam_to_loc_df	find all mapped region in a .sam data.frame
cal_coverage()	calculate genome coverage
get_dg_coverage()	calculate average coverage of duplex group segment