number of bins 5925312 K562 idr optimal regions 2203660 naive regions 3014410 GM12878 idr optimal regions 1613988 naive regions 2129228 HepG2 idr optimal regions 1841160 naive regions 2735909 A549 idr optimal regions 1432157 naive regions 2160973 MCF-7 idr optimal regions 1580137 naive regions 2185620