##fileformat=VCFv4.1
##FORMAT=<ID=GT,Number=1,Type=String,Description="Genotype">
##contig=<ID=20,assembly=b37>
##contig=<ID=21,assembly=b37>
##contig=<ID=22,assembly=b37>
##contig=<ID=X,assembly=b37>
#CHROM	POS	ID	REF	ALT	QUAL	FILTER	INFO	FORMAT	S1
20	1	1	C	G	.	PASS	.	GT	0/0
21	1	2	C	G	.	PASS	.	GT	./0
22	1	3	C	G	.	PASS	.	GT	./.
X	1	4	C	G	.	PASS	.	GT	.
