distribute	reads
0-500	106131
500-800	56951
800-1000	26156
1000-1200	21543
1200-1400	18308
1400-1600	16627
1600-1800	14755
1800-2000	13410
2000-2200	12334
2200-2400	11248
2400-2600	10411
2600-2800	9860
2800-3000	9222
>3000	129578
