@CO	xx has been encoded using the SAM spec; leftmost to rightmost
@CO	yy has been encoded using bwa/picard methods; 5' to 3'
@CO
@CO	00000000011111111112
@CO	12345678901234567890
@CO	AAAAAAAAAATTTTTTTTTT
@CO	1>>>>          <<<<2   x1
@CO	
@CO	      1>>>>    	       x2
@CO	         <<<<2
@CO	
@CO	         1>>>>	       x3 (7..15 vs 10..11)
@CO	      <<<<2
@CO	
@CO	<<<<2          1>>>>   x4 (1..20 vs 16..5)
@CO
@SQ	SN:xx	LN:20
@SQ	SN:yy	LN:20
x1	99	xx	1	1	5M	=	16	20	AAAAA	*****
x1	147	xx	16	1	5M	=	1	-20	TTTTT	*****
x2	99	xx	7	1	5M	=	10	8	AAAAT	*****
x2	147	xx	10	1	5M	=	7	-8	ATTTT	*****
x3	147	xx	7	1	5M	=	10	8	AAAAT	*****
x3	99	xx	10	1	5M	=	7	-8	ATTTT	*****
x4	147	xx	1	1	5M	=	16	20	AAAAA	*****
x4	99	xx	16	1	5M	=	1	-20	TTTTT	*****
y1	99	yy	1	1	5M	=	16	20	AAAAA	*****
y1	147	yy	16	1	5M	=	1	-20	TTTTT	*****
y2	99	yy	7	1	5M	=	10	8	AAAAT	*****
y2	147	yy	10	1	5M	=	7	-8	ATTTT	*****
y3	147	yy	7	1	5M	=	10	-2	AAAAT	*****
y3	99	yy	10	1	5M	=	7	2	ATTTT	*****
y4	147	yy	1	1	5M	=	16	10	AAAAA	*****
y4	99	yy	16	1	5M	=	1	-10	TTTTT	*****