Gurobi 5.0.1 (linux64) logging started Fri Jan 18 04:17:51 2013

Optimize a model with 600 rows, 8220 columns and 48560 nonzeros
Presolve removed 20 rows and 20 columns
Presolve time: 0.06s
Presolved: 580 rows, 8200 columns, 44540 nonzeros
Variable types: 8040 continuous, 160 integer (160 binary)

Root relaxation: objective 4.642213e+04, 526 iterations, 0.01 seconds

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

     0     0 46422.1265    0    9          - 46422.1265     -      -    0s
     0     0 46423.3217    0    6          - 46423.3217     -      -    0s
     0     0 46423.3286    0    9          - 46423.3286     -      -    0s
     0     0 46423.3286    0    9          - 46423.3286     -      -    0s
     0     0 46423.3286    0    9          - 46423.3286     -      -    0s
     0     0 46423.3286    0    9          - 46423.3286     -      -    0s
     0     0 46423.3286    0    9          - 46423.3286     -      -    0s
     0     2 46426.1363    0    9          - 46426.1363     -      -    0s
*   43    36              41    46979.693927 46448.2552  1.13%  13.7    0s
*   63    24              18    46855.348685 46458.4626  0.85%  12.7    0s
*   78    19              13    46745.282431 46556.8807  0.40%  12.0    0s

Cutting planes:
  Flow cover: 9

Explored 108 nodes (2324 simplex iterations) in 1.04 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.674528243129e+04, best bound 4.674348016162e+04, gap 0.0039%