##fileformat=VCFv4.2
#CHROM	POS	ID	REF	ALT	QUAL	FILTER	INFO
chr1	100	.	A	G	.	.	.
chr1	250	.	C	T	.	.	.
chr2	50	.	G	A	.	.	.
chr2	900	.	T	C	.	.	.