Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:53:34 2013

Optimize a model with 15225 rows, 2025 columns and 46575 nonzeros
Presolve removed 3070 rows and 1075 columns
Presolve time: 0.11s
Presolved: 12155 rows, 950 columns, 36925 nonzeros
Variable types: 11 continuous, 939 integer (939 binary)
Found heuristic solution: objective 47918.000000

Root relaxation: objective 4.197696e+04, 1715 iterations, 0.08 seconds

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

     0     0 41976.9615    0    4 47918.0000 41976.9615  12.4%     -    0s
H    0     0                    41983.000000 41976.9615  0.01%     -    0s
     0     0 41980.5432    0   12 41983.0000 41980.5432  0.01%     -    0s

Cutting planes:
  Gomory: 1
  MIR: 4
  Mod-K: 2

Explored 0 nodes (1761 simplex iterations) in 0.28 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.198300000000e+04, best bound 4.198100000000e+04, gap 0.0048%