Gurobi 5.0.1 (linux64) logging started Fri Jan 18 01:40:20 2013

Optimize a model with 52 rows, 312 columns and 1906 nonzeros
Presolve removed 22 rows and 79 columns
Presolve time: 0.00s
Presolved: 30 rows, 233 columns, 1664 nonzeros
Variable types: 221 continuous, 12 integer (12 binary)
Found heuristic solution: objective 7479.7220682

Root relaxation: objective 7.444602e+03, 12 iterations, 0.00 seconds

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

     0     0 7444.60178    0    3 7479.72207 7444.60178  0.47%     -    0s
     0     0 7457.65794    0    5 7479.72207 7457.65794  0.29%     -    0s
     0     0 7457.65794    0    2 7479.72207 7457.65794  0.29%     -    0s
     0     0 7457.75059    0    5 7479.72207 7457.75059  0.29%     -    0s
     0     0 7457.81566    0    5 7479.72207 7457.81566  0.29%     -    0s
     0     0 7457.81611    0    5 7479.72207 7457.81611  0.29%     -    0s
     0     0 7457.81962    0    5 7479.72207 7457.81962  0.29%     -    0s
     0     0 7459.10841    0    1 7479.72207 7459.10841  0.28%     -    0s
     0     0 7459.10841    0    1 7479.72207 7459.10841  0.28%     -    0s
H    0     0                    7459.1412119 7459.10841  0.00%     -    0s

Cutting planes:
  Flow cover: 1

Explored 0 nodes (94 simplex iterations) in 0.02 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.459141211889e+03, best bound 7.459108412470e+03, gap 0.0004%