The Prenucleolus (Prescision=12 places): 

x1 = 0.5000000000000 
x2 = 0.5000000000000 

Excesses:

0.0000000000000 ( )
0.0000000000000 ( 1 2 )
-0.5000000000000 ( 1 )
-0.5000000000000 ( 2 )

Vector v:

0.0000000000000 ( )
0.0000000000000 ( 2 )
0.0000000000000 ( 1 )
1.0000000000000 ( 1 2 )