length	num_GC	number_of_fragments
12	0	49268446
12	1	161788264
12	2	388225374
12	3	666247008
12	4	868089494
12	5	909242588
12	6	806961068
12	7	584978928
12	8	330284878
12	9	133466714
12	10	36552958
12	11	7599362
12	12	1251880
