The Prenucleolus (Prescision=14 places): 

x1 = 10.250000000000000 
x2 = 10.250000000000009 
x3 = 9.500000000000002 

Excesses:

3.000000000000000 ( )
-0.000000000000007 ( 1 2 3 )
-9.500000000000002 ( 3 )
-9.500000000000007 ( 1 2 )
-10.250000000000000 ( 1 )
-10.250000000000009 ( 2 )
-10.750000000000000 ( 1 3 )
-10.750000000000011 ( 2 3 )

Vector v:

3.000000000000000 ( )
0.000000000000000 ( 3 )
0.000000000000000 ( 2 )
9.000000000000000 ( 2 3 )
0.000000000000000 ( 1 )
9.000000000000000 ( 1 3 )
11.000000000000000 ( 1 2 )
30.000000000000000 ( 1 2 3 )