Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:12:17 2013

Optimize a model with 26571 rows, 26061 columns and 104091 nonzeros
Presolve removed 2050 rows and 0 columns
Presolve time: 0.15s
Presolved: 24521 rows, 26061 columns, 99991 nonzeros
Variable types: 26010 continuous, 51 integer (51 binary)

Root relaxation: objective 6.881159e+04, 5162 iterations, 0.47 seconds

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

     0     0 68811.5913    0    2          - 68811.5913     -      -    0s
H    0     0                    69207.000000 68811.5913  0.57%     -    0s
H    0     0                    69179.000000 68811.5913  0.53%     -    0s
H    0     0                    68859.000000 68811.5913  0.07%     -    0s
     0     0 68813.0675    0    2 68859.0000 68813.0675  0.07%     -    0s
     0     0 68813.0675    0    2 68859.0000 68813.0675  0.07%     -    1s
     0     0 68813.0675    0    2 68859.0000 68813.0675  0.07%     -    1s
H    0     0                    68818.000000 68813.0675  0.01%     -    1s

Cutting planes:
  Gomory: 1
  Flow cover: 1

Explored 0 nodes (6948 simplex iterations) in 1.47 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.881800000000e+04, best bound 6.881306753247e+04, gap 0.0072%