distribute	reads
0-500	1932
500-800	8693
800-1000	6904
1000-1200	7950
1200-1400	9058
1400-1600	10206
1600-1800	10643
1800-2000	10838
2000-2200	10470
2200-2400	9720
2400-2600	9186
2600-2800	8424
2800-3000	7736
>3000	60892
