name,size
chr1,249250621
chr2,243199373
chr3,198022430
chr4,191154276
chr5,180915260
chr6,171115067
chr7,159138663
chr8,146364022
chr9,141213431
chr10,135534747
chr11,135006516
chr12,133851895
chr13,115169878
chr14,107349540
chr15,102531392
chr16,90354753
chr17,81195210
chr18,78077248
chr19,59128983
chr20,63025520
chr21,48129895
chr22,51304566
chrx,155270560
chry,59373566