Gurobi 5.0.1 (linux64) logging started Sat Dec  8 03:33:11 2012

Optimize a model with 1635 rows, 1620 columns and 5924 nonzeros
Presolve removed 159 rows and 42 columns
Presolve time: 0.01s
Presolved: 1476 rows, 1578 columns, 5598 nonzeros
Variable types: 1406 continuous, 172 integer (172 binary)

Root relaxation: objective 6.040582e+04, 289 iterations, 0.00 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

     0     0 60405.8180    0   11          - 60405.8180     -      -    0s
H    0     0                    62040.000000 60405.8180  2.63%     -    0s
     0     0 60540.0026    0   16 62040.0000 60540.0026  2.42%     -    0s
     0     0 60546.0437    0   20 62040.0000 60546.0437  2.41%     -    0s
H    0     0                    61030.000000 60546.0437  0.79%     -    0s
     0     2 60548.5848    0   20 61030.0000 60548.5848  0.79%     -    0s
H   18    16                    60964.000000 60584.5034  0.62%   4.2    0s
*   23    19              19    60892.000000 60584.5034  0.50%   4.3    0s
*   26    18              19    60880.000000 60584.5034  0.49%   4.3    0s
*   40    15              12    60734.000000 60631.6254  0.17%   4.4    0s

Cutting planes:
  Gomory: 2
  Flow cover: 8

Explored 110 nodes (698 simplex iterations) in 0.13 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.073400000000e+04, best bound 6.073011069292e+04, gap 0.0064%