Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:44:04 2013

Optimize a model with 40383 rows, 39753 columns and 158823 nonzeros
Presolve removed 1368 rows and 0 columns
Presolve time: 0.23s
Presolved: 39015 rows, 39753 columns, 156087 nonzeros
Variable types: 39690 continuous, 63 integer (63 binary)

Root relaxation: objective 6.740103e+04, 7928 iterations, 1.12 seconds

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

     0     0 67401.0330    0    4          - 67401.0330     -      -    1s
H    0     0                    68912.000000 67401.0330  2.19%     -    1s
H    0     0                    68678.000000 67401.0330  1.86%     -    1s
     0     0 67406.7200    0    5 68678.0000 67406.7200  1.85%     -    1s
H    0     0                    68244.000000 67406.7200  1.23%     -    2s
     0     0 67406.9581    0    5 68244.0000 67406.9581  1.23%     -    2s
     0     2 67408.3481    0    5 68244.0000 67408.3481  1.22%     -    3s
H    6     6                    68102.666667 67545.2105  0.82%   155    3s
H   10     5                    67734.000000 67545.2105  0.28%   126    4s
*   13     5              12    67703.000000 67545.2105  0.23%   109    4s

Cutting planes:
  Gomory: 2
  Flow cover: 4

Explored 21 nodes (9845 simplex iterations) in 4.29 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.770300000000e+04, best bound 6.770300000000e+04, gap 0.0%