Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:36:15 2013

Optimize a model with 37881 rows, 37271 columns and 148901 nonzeros
Presolve removed 3494 rows and 0 columns
Presolve time: 0.22s
Presolved: 34387 rows, 37271 columns, 141913 nonzeros
Variable types: 37210 continuous, 61 integer (61 binary)

Root relaxation: objective 6.296989e+04, 7285 iterations, 1.08 seconds

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

     0     0 62969.8869    0    3          - 62969.8869     -      -    1s
H    0     0                    64579.000000 62969.8869  2.49%     -    1s
     0     0 62972.2645    0    4 64579.0000 62972.2645  2.49%     -    1s
     0     0 62972.2645    0    4 64579.0000 62972.2645  2.49%     -    1s
H    0     0                    64139.721311 62972.2645  1.82%     -    2s
H    0     0                    64026.147541 62972.2645  1.65%     -    2s
     0     2 62980.1196    0    4 64026.1475 62980.1196  1.63%     -    3s
H    3     3                    63250.647887 63116.4247  0.21%   158    3s
*    6     0               5    63181.000000 63181.0000   0.0%   162    3s

Cutting planes:
  Gomory: 2
  Flow cover: 6

Explored 7 nodes (8393 simplex iterations) in 3.53 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.318100000000e+04, best bound 6.318100000000e+04, gap 0.0%