Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:58:00 2013

Optimize a model with 44352 rows, 43692 columns and 174372 nonzeros
Presolve removed 66 rows and 0 columns
Presolve time: 0.19s
Presolved: 44286 rows, 43692 columns, 174306 nonzeros
Variable types: 43626 continuous, 66 integer (66 binary)

Root relaxation: objective 5.375460e+04, 5600 iterations, 2.72 seconds

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

     0     0 53754.6030    0   52          - 53754.6030     -      -    3s
H    0     0                    77719.000000 53754.6030  30.8%     -    4s
     0     0 64436.6827    0   15 77719.0000 64436.6827  17.1%     -    9s
H    0     0                    72527.000000 64436.6827  11.2%     -    9s
     0     0 67717.5941    0   11 72527.0000 67717.5941  6.63%     -   11s
H    0     0                    68436.000000 67717.5941  1.05%     -   11s
     0     0 67967.6945    0    4 68436.0000 67967.6945  0.68%     -   12s
H    0     0                    68063.000000 67967.6945  0.14%     -   12s
     0     0 68056.6228    0    5 68063.0000 68056.6228  0.01%     -   12s

Cutting planes:
  Implied bound: 62

Explored 0 nodes (12085 simplex iterations) in 12.81 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.806300000000e+04, best bound 6.805662277283e+04, gap 0.0094%