Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:51:08 2013

Optimize a model with 42965 rows, 42315 columns and 169065 nonzeros
Presolve removed 3723 rows and 0 columns
Presolve time: 0.25s
Presolved: 39242 rows, 42315 columns, 161619 nonzeros
Variable types: 42250 continuous, 65 integer (65 binary)

Root relaxation: objective 6.590420e+04, 7437 iterations, 1.30 seconds

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

     0     0 65904.2010    0    6          - 65904.2010     -      -    1s
H    0     0                    68398.000000 65904.2010  3.65%     -    1s
H    0     0                    68278.000000 65904.2010  3.48%     -    1s
H    0     0                    66239.000000 65904.2010  0.51%     -    2s
     0     0 65910.0137    0    9 66239.0000 65910.0137  0.50%     -    2s
     0     0 65910.0137    0    9 66239.0000 65910.0137  0.50%     -    2s
     0     0 65910.2560    0    8 66239.0000 65910.2560  0.50%     -    3s
H    0     0                    66138.000000 65910.2560  0.34%     -    4s
     0     0 65918.6854    0    4 66138.0000 65918.6854  0.33%     -    5s
     0     0 65924.3618    0    6 66138.0000 65924.3618  0.32%     -    5s
     0     0 65924.3618    0    6 66138.0000 65924.3618  0.32%     -    5s
     0     2 65928.3189    0    6 66138.0000 65928.3189  0.32%     -    6s

Cutting planes:
  Gomory: 2
  Flow cover: 3

Explored 13 nodes (10849 simplex iterations) in 6.70 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.613800000000e+04, best bound 6.613800000000e+04, gap 0.0%