The Prenucleolus (Prescision=14 places): 

x1 = 0.500000000000000 
x2 = 0.500000000000000 
x3 = 3.000000000000002 

Excesses:

3.000000000000000 ( )
-0.000000000000002 ( 1 2 3 )
-0.500000000000000 ( 2 )
-0.500000000000000 ( 1 )
-0.500000000000002 ( 2 3 )
-0.500000000000002 ( 1 3 )
-1.000000000000000 ( 1 2 )
-3.000000000000002 ( 3 )

Vector v:

3.000000000000000 ( )
0.000000000000000 ( 3 )
0.000000000000000 ( 2 )
3.000000000000000 ( 2 3 )
0.000000000000000 ( 1 )
3.000000000000000 ( 1 3 )
0.000000000000000 ( 1 2 )
4.000000000000000 ( 1 2 3 )