Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:12:22 2013

Optimize a model with 561 rows, 26061 columns and 52071 nonzeros
Presolve time: 0.04s
Presolved: 561 rows, 26061 columns, 52071 nonzeros
Variable types: 26010 continuous, 51 integer (51 binary)

Root relaxation: objective 6.964841e+04, 1350 iterations, 0.03 seconds

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

     0     0 69648.4146    0    6          - 69648.4146     -      -    0s
H    0     0                    71480.000000 69648.4146  2.56%     -    0s
H    0     0                    71307.000000 69648.4146  2.33%     -    0s
H    0     0                    69779.000000 69648.4146  0.19%     -    0s
     0     0 69737.9460    0    3 69779.0000 69737.9460  0.06%     -    0s
     0     0 69753.7412    0    3 69779.0000 69753.7412  0.04%     -    0s
     0     0 69753.7412    0    5 69779.0000 69753.7412  0.04%     -    0s
     0     0 69753.7412    0    3 69779.0000 69753.7412  0.04%     -    0s
     0     0 69753.7412    0    4 69779.0000 69753.7412  0.04%     -    0s
     0     0 69757.2542    0    2 69779.0000 69757.2542  0.03%     -    0s
     0     0 69758.9574    0    2 69779.0000 69758.9574  0.03%     -    0s
     0     0 69761.4000    0    2 69779.0000 69761.4000  0.03%     -    0s
     0     0 69762.0000    0    1 69779.0000 69762.0000  0.02%     -    0s
H    0     0                    69768.000000 69762.0000  0.01%     -    0s

Cutting planes:
  Implied bound: 34
  Flow cover: 6

Explored 0 nodes (2755 simplex iterations) in 0.54 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.976800000000e+04, best bound 6.976200000000e+04, gap 0.0086%