The Prenucleolus: 

x1 = 600
x2 = 600
x3 = 2.95902e-13
x4 = 2.99288e-13

Excesses:

0 ()
-2.95902e-13 (3 )
-2.99288e-13 (4 )
-5.95191e-13 (3 4 )
-6.82121e-11 (2 )
-6.85532e-11 (2 3 )
-1.00007e-06 (1 4 )
-1.00007e-06 (1 3 )
-1.00014e-06 (1 2 3 )
-1.00014e-06 (1 2 3 4 )
-100 (1 3 4 )
-600 (2 4 )
-600 (2 3 4 )
-600 (1 )
-600 (1 2 )
-600 (1 2 4 )