Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:12:25 2013

Optimize a model with 48369 rows, 47679 columns and 190509 nonzeros
Presolve removed 2547 rows and 0 columns
Presolve time: 0.30s
Presolved: 45822 rows, 47679 columns, 185415 nonzeros
Variable types: 47610 continuous, 69 integer (69 binary)

Root relaxation: objective 7.119480e+04, 8457 iterations, 1.43 seconds

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

     0     0 71194.8010    0    4          - 71194.8010     -      -    1s
H    0     0                    72995.000000 71194.8010  2.47%     -    2s
     0     0 71196.4437    0    6 72995.0000 71196.4437  2.46%     -    2s
     0     0 71196.4437    0    6 72995.0000 71196.4437  2.46%     -    2s
H    0     0                    71971.581081 71196.4437  1.08%     -    3s
H    0     0                    71853.025000 71196.4437  0.91%     -    3s
H    0     0                    71829.000000 71196.4437  0.88%     -    3s
     0     2 71198.0413    0    6 71829.0000 71198.0413  0.88%     -    4s
H    4     4                    71716.075682 71410.0339  0.43%   182    4s
     7     8 71468.1667    6    1 71716.0757 71410.0339  0.43%   120    5s
H   12     8                    71516.000000 71410.0339  0.15%  90.1    5s
*   15     7              12    71499.000000 71410.0339  0.12%  80.1    5s

Cutting planes:
  Gomory: 1
  Flow cover: 2

Explored 27 nodes (10227 simplex iterations) in 5.76 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.149900000000e+04, best bound 7.149735440279e+04, gap 0.0023%