The Prenucleolus (Prescision=12 places): 

x1 = 42.0000000000003 
x2 = 9.0000000000000 
x3 = 9.0000000000000 

Excesses:

0.0000000000000 ( )
-0.0000000000003 ( 1 2 3 )
-9.0000000000000 ( 2 )
-9.0000000000000 ( 3 )
-9.0000000000003 ( 1 3 )
-9.0000000000003 ( 1 2 )
-17.9999999999999 ( 2 3 )
-42.0000000000003 ( 1 )

Vector v:

0.0000000000000 ( )
0.0000000000000 ( 3 )
0.0000000000000 ( 2 )
0.0000000000000 ( 2 3 )
0.0000000000000 ( 1 )
42.0000000000000 ( 1 3 )
42.0000000000000 ( 1 2 )
60.0000000000000 ( 1 2 3 )