variableStep chrom=chrI
9704438	1
9704439	1
9704440	1
9704441	1
9704442	1
9704443	1
9704444	1
9704445	1
9704446	1
9704447	1
variableStep chrom=chrII
9704440	1
9704441	1
9704442	1
9704443	1
9704444	1