chr	pos	ref	a_freq	c_freq	g_freq	t_freq	del_freq	ins_freq	call1	call2	call3	call4	call5	call6
chr4	106157698	T	NA	0.435374149659864	NA	0.557823129251701	0.00680272108843537	NA	T	C	NA	NA	NA	NA
