Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:24:20 2013

Optimize a model with 51191 rows, 50481 columns and 201711 nonzeros
Presolve removed 3361 rows and 0 columns
Presolve time: 0.32s
Presolved: 47830 rows, 50481 columns, 194989 nonzeros
Variable types: 50410 continuous, 71 integer (71 binary)

Root relaxation: objective 8.668642e+04, 12501 iterations, 2.35 seconds

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

     0     0 86686.4152    0    5          - 86686.4152     -      -    2s
H    0     0                    88172.000000 86686.4152  1.68%     -    2s
H    0     0                    86807.000000 86686.4152  0.14%     -    3s
     0     0 86691.7857    0    7 86807.0000 86691.7857  0.13%     -    3s
     0     0 86691.7857    0    5 86807.0000 86691.7857  0.13%     -    4s
     0     0 86692.7867    0    7 86807.0000 86692.7867  0.13%     -    4s
     0     0 86692.8248    0    7 86807.0000 86692.8248  0.13%     -    5s
     0     2 86696.5963    0    7 86807.0000 86696.5963  0.13%     -    5s

Cutting planes:
  Gomory: 1
  Flow cover: 8

Explored 32 nodes (17220 simplex iterations) in 6.50 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 8.680700000000e+04, best bound 8.680194791667e+04, gap 0.0058%