segsites: 2	tMRCA: 0.6398829	
Fsense 1	founders: 2	
-4	0
-4	0
-1	1
-4	0
-segsites: 2	tMRCA: 0.3395337	
Fsense 1	founders: 2	
0	0
0	0
-3	-1
0	0