chr	pos	gene	cell	ref_base	alt_base	rA	rC	rG	rT	rN	A	C	G	T	N	num_umi	umi_mean_purity	read_pval	read_ratio	read_ci_low	read_ci_high	umi_pval	umi_ratio	umi_ci_low	umi_ci_high
