distribute	reads
0-500	1761
500-800	2705
800-1000	2355
1000-1200	3206
1200-1400	3833
1400-1600	3773
1600-1800	3705
1800-2000	3550
2000-2200	3292
2200-2400	3304
2400-2600	3245
2600-2800	3015
2800-3000	2910
>3000	51674
