##fileformat=VCFv4.2
##contig=<ID=1,assembly=b37,length=249250621>
##reference=file:///lustre/scratch105/projects/g1k/ref/main_project/human_g1k_v37.fasta
##FORMAT=<ID=GT,Number=1,Type=String,Description="Genotype">
#CHROM	POS	ID	REF	ALT	QUAL	FILTER	INFO	FORMAT	B	A
1	3000001	.	C	T	.	.	.	GT	.	.
1	3000002	.	C	T	.	.	.	GT	1|1	0
1	3000003	.	C	CT,CTT	.	.	.	GT	1|1	0
X	3000001	.	C	T	.	.	.	GT	.	.
X	3000002	.	C	T	.	.	.	GT	1|1	0
X	3000003	.	C	CT,CTT	.	.	.	GT	1|1	0