chr1	0	50000	38
chr1	50000	100000	37
chr1	100000	150000	42
chr1	150000	200000	48
chr1	200000	250000	7
chr1	250000	300000	31
chr1	300000	350000	1
chr1	350000	400000	47
chr1	400000	450000	39
chr1	450000	500000	41