distribute	reads
0-500	4790
500-800	4708
800-1000	5319
1000-1200	8138
1200-1400	12175
1400-1600	16430
1600-1800	19627
1800-2000	21479
2000-2200	21948
2200-2400	20571
2400-2600	19070
2600-2800	16388
2800-3000	13590
>3000	44400
