Gurobi 5.0.1 (linux64) logging started Thu Jan 17 23:16:24 2013

Optimize a model with 320 rows, 4160 columns and 8340 nonzeros
Presolve removed 40 rows and 60 columns
Presolve time: 0.01s
Presolved: 280 rows, 4100 columns, 8200 nonzeros
Variable types: 4080 continuous, 20 integer (20 binary)

Root relaxation: objective 3.709539e+04, 374 iterations, 0.01 seconds

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

     0     0 37095.3933    0    4          - 37095.3933     -      -    0s
H    0     0                    40547.652845 37095.3933  8.51%     -    0s
H    0     0                    37235.483466 37095.3933  0.38%     -    0s
     0     0 37133.3030    0    3 37235.4835 37133.3030  0.27%     -    0s
     0     0 37134.0030    0    3 37235.4835 37134.0030  0.27%     -    0s
     0     0 37134.0030    0    3 37235.4835 37134.0030  0.27%     -    0s
     0     0 37135.6669    0    3 37235.4835 37135.6669  0.27%     -    0s
     0     0 37136.4751    0    2 37235.4835 37136.4751  0.27%     -    0s
     0     0 37136.4751    0    2 37235.4835 37136.4751  0.27%     -    0s
     0     0 37136.4751    0    2 37235.4835 37136.4751  0.27%     -    0s
     0     0 37136.4751    0    2 37235.4835 37136.4751  0.27%     -    0s
     0     0 37231.9138    0    1 37235.4835 37231.9138  0.01%     -    0s

Cutting planes:
  Flow cover: 8

Explored 0 nodes (493 simplex iterations) in 0.08 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.723548346646e+04, best bound 3.723191384238e+04, gap 0.0096%