distribute	reads
0-500	13911
500-800	11527
800-1000	4940
1000-1200	5670
1200-1400	7315
1400-1600	9580
1600-1800	11763
1800-2000	12544
2000-2200	12502
2200-2400	11583
2400-2600	10449
2600-2800	8303
2800-3000	6766
>3000	30157
