Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:23:01 2013

Optimize a model with 616 rows, 31416 columns and 62776 nonzeros
Presolve time: 0.04s
Presolved: 616 rows, 31416 columns, 62776 nonzeros
Variable types: 31360 continuous, 56 integer (56 binary)

Root relaxation: objective 6.136219e+04, 1436 iterations, 0.04 seconds

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

     0     0 61362.1922    0    5          - 61362.1922     -      -    0s
H    0     0                    63179.000000 61362.1922  2.88%     -    0s
     0     0 61671.3646    0    5 63179.0000 61671.3646  2.39%     -    0s
     0     0 61674.5005    0    5 63179.0000 61674.5005  2.38%     -    0s
     0     0 61693.9967    0    7 63179.0000 61693.9967  2.35%     -    0s
     0     0 61696.9135    0    5 63179.0000 61696.9135  2.35%     -    0s
     0     0 61697.9946    0    3 63179.0000 61697.9946  2.34%     -    0s
     0     0 61698.8298    0    4 63179.0000 61698.8298  2.34%     -    0s
     0     0 61698.9457    0    4 63179.0000 61698.9457  2.34%     -    0s
     0     0 61698.9457    0    4 63179.0000 61698.9457  2.34%     -    0s
     0     0 61699.0533    0    5 63179.0000 61699.0533  2.34%     -    0s
     0     2 61700.4735    0    5 63179.0000 61700.4735  2.34%     -    0s
H    2     2                    62936.382645 61739.9579  1.90%   9.5    0s
H    6     6                    62267.090909 61768.6771  0.80%  39.5    0s
*    9     7               8    61889.000000 61768.6771  0.19%  48.4    0s

Cutting planes:
  Implied bound: 112
  Flow cover: 6

Explored 23 nodes (2603 simplex iterations) in 1.00 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.188900000000e+04, best bound 6.188900000000e+04, gap 0.0%