Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:23:51 2013

Optimize a model with 51191 rows, 50481 columns and 201711 nonzeros
Presolve removed 2663 rows and 0 columns
Presolve time: 0.31s
Presolved: 48528 rows, 50481 columns, 196385 nonzeros
Variable types: 50410 continuous, 71 integer (71 binary)

Root relaxation: objective 6.944448e+04, 8682 iterations, 1.51 seconds

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

     0     0 69444.4822    0    3          - 69444.4822     -      -    1s
H    0     0                    70156.000000 69444.4822  1.01%     -    2s
     0     0 69445.8972    0    5 70156.0000 69445.8972  1.01%     -    2s
     0     2 69446.4320    0    5 70156.0000 69446.4320  1.01%     -    5s
H    5     3                    69757.666667 69570.6667  0.27%   192    6s
H   11     4                    69740.000000 69642.9132  0.14%   120    6s
*   17     2               6    69694.000000 69666.2261  0.04%   100    6s

Cutting planes:
  Gomory: 2
  Flow cover: 2

Explored 21 nodes (10589 simplex iterations) in 7.02 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.969400000000e+04, best bound 6.969123529412e+04, gap 0.0040%