distribute	reads
0-500	5630
500-800	8205
800-1000	3625
1000-1200	3131
1200-1400	2859
1400-1600	2866
1600-1800	2847
1800-2000	2854
2000-2200	2746
2200-2400	2638
2400-2600	2597
2600-2800	2339
2800-3000	2287
>3000	13597
