Gurobi 5.0.1 (linux64) logging started Fri Jan 18 01:41:41 2013

Optimize a model with 520 rows, 6720 columns and 26260 nonzeros
Presolve removed 20 rows and 580 columns
Presolve time: 0.06s
Presolved: 500 rows, 6140 columns, 24260 nonzeros
Variable types: 6020 continuous, 120 integer (120 binary)

Root relaxation: objective 3.860476e+04, 590 iterations, 0.02 seconds

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

     0     0 38604.7615    0    9          - 38604.7615     -      -    0s
     0     0 38618.6392    0    9          - 38618.6392     -      -    0s
     0     0 38618.6392    0    9          - 38618.6392     -      -    0s
     0     0 38618.6392    0    9          - 38618.6392     -      -    0s
H    0     0                    40971.211393 38618.6392  5.74%     -    0s
     0     2 38618.6392    0    9 40971.2114 38618.6392  5.74%     -    0s
H   27    19                    38868.058519 38830.8895  0.10%   9.5    0s
*   38     5               6    38861.053897 38839.8330  0.05%   8.9    0s

Cutting planes:
  Flow cover: 4

Explored 46 nodes (1163 simplex iterations) in 0.71 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.886105389705e+04, best bound 3.885937005561e+04, gap 0.0043%