Gurobi 5.0.1 (linux64) logging started Fri Jan 18 01:41:43 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 4.013975e+04, 441 iterations, 0.02 seconds

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

     0     0 40139.7487    0    6          - 40139.7487     -      -    0s
     0     0 40139.7487    0    6          - 40139.7487     -      -    0s
     0     0 40139.7487    0    6          - 40139.7487     -      -    0s
     0     0 40139.9692    0    6          - 40139.9692     -      -    0s
     0     0 40139.9692    0    6          - 40139.9692     -      -    0s
H    0     0                    40205.095112 40139.9692  0.16%     -    0s
     0     1 40147.7455    0    6 40205.0951 40147.7455  0.14%     -    0s
*   10     4               8    40196.441966 40191.6244  0.01%  18.2    0s

Cutting planes:
  Flow cover: 3

Explored 14 nodes (998 simplex iterations) in 0.40 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.019644196637e+04, best bound 4.019458177369e+04, gap 0.0046%