Gurobi 5.0.1 (linux64) logging started Fri Jan 18 02:50:13 2013

Optimize a model with 560 rows, 9300 columns and 48300 nonzeros
Presolve removed 20 rows and 1140 columns
Presolve time: 0.06s
Presolved: 540 rows, 8160 columns, 44300 nonzeros
Variable types: 8020 continuous, 140 integer (140 binary)

Root relaxation: objective 3.894400e+04, 550 iterations, 0.02 seconds

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

     0     0 38944.0027    0    8          - 38944.0027     -      -    0s
     0     0 38950.2947    0    8          - 38950.2947     -      -    0s
     0     0 38951.2130    0    8          - 38951.2130     -      -    0s
     0     0 38951.8265    0    8          - 38951.8265     -      -    0s
     0     0 38951.8400    0    8          - 38951.8400     -      -    0s
     0     0 38951.8400    0    8          - 38951.8400     -      -    0s
     0     2 38954.7998    0    8          - 38954.7998     -      -    0s
*   45    31              39    39390.088930 39075.5970  0.80%   7.7    0s
*   69    20              21    39273.154809 39092.2409  0.46%   6.9    0s
*   72    17              19    39271.995523 39092.2409  0.46%   6.7    0s
*  102    27              20    39269.002092 39207.7362  0.16%   7.6    0s
H  105    22                    39267.717569 39207.7362  0.15%   7.4    1s
*  138     7              18    39252.212472 39226.5845  0.07%   6.8    1s
*  146     6              14    39250.007569 39247.0657  0.01%   6.7    1s

Cutting planes:
  Flow cover: 8

Explored 147 nodes (1799 simplex iterations) in 1.08 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.925000756910e+04, best bound 3.924706572563e+04, gap 0.0075%