Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:20:17 2013

Optimize a model with 30855 rows, 30305 columns and 121055 nonzeros
Presolve removed 2568 rows and 0 columns
Presolve time: 0.18s
Presolved: 28287 rows, 30305 columns, 115919 nonzeros
Variable types: 30250 continuous, 55 integer (55 binary)

Root relaxation: objective 6.719120e+04, 6380 iterations, 0.68 seconds

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

     0     0 67191.2025    0    3          - 67191.2025     -      -    0s
H    0     0                    67364.000000 67191.2025  0.26%     -    0s
     0     0 67191.4146    0    4 67364.0000 67191.4146  0.26%     -    1s
     0     0 67257.1176    0    1 67364.0000 67257.1176  0.16%     -    1s
H    0     0                    67324.000000 67257.1176  0.10%     -    1s
H    0     0                    67268.000000 67257.1176  0.02%     -    1s
     0     0 67257.1176    0    1 67268.0000 67257.1176  0.02%     -    2s
     0     0 67263.1667    0    1 67268.0000 67263.1667  0.01%     -    2s

Cutting planes:
  Gomory: 1
  Flow cover: 5

Explored 0 nodes (8164 simplex iterations) in 2.19 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.726800000000e+04, best bound 6.726316666667e+04, gap 0.0072%