Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:57:27 2013

Optimize a model with 726 rows, 43626 columns and 87186 nonzeros
Presolve time: 0.06s
Presolved: 726 rows, 43626 columns, 87186 nonzeros
Variable types: 43560 continuous, 66 integer (66 binary)

Root relaxation: objective 6.826876e+04, 1486 iterations, 0.05 seconds

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

     0     0 68268.7578    0    8          - 68268.7578     -      -    0s
H    0     0                    71796.000000 68268.7578  4.91%     -    0s
     0     0 68565.1099    0    6 71796.0000 68565.1099  4.50%     -    0s
     0     0 68593.1809    0    6 71796.0000 68593.1809  4.46%     -    0s
     0     0 68619.5702    0    5 71796.0000 68619.5702  4.42%     -    0s
     0     0 68625.8199    0    3 71796.0000 68625.8199  4.42%     -    0s
     0     0 68626.1539    0    4 71796.0000 68626.1539  4.42%     -    0s
     0     0 68626.9337    0    4 71796.0000 68626.9337  4.41%     -    0s
H    0     0                    70591.000000 68626.9337  2.78%     -    0s
     0     0 68626.9337    0    4 70591.0000 68626.9337  2.78%     -    0s
     0     2 68627.2556    0    4 70591.0000 68627.2556  2.78%     -    1s
H    1     1                    68896.187500 68627.2556  0.39%   0.0    1s
H    3     3                    68817.504505 68656.3770  0.23%  30.0    1s
*   10     3               8    68704.000000 68659.6159  0.06%  36.9    1s
*   17     2               7    68691.000000 68671.0000  0.03%  27.8    1s

Cutting planes:
  Implied bound: 91
  Flow cover: 6

Explored 20 nodes (2420 simplex iterations) in 1.30 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.869100000000e+04, best bound 6.868886538462e+04, gap 0.0031%