Gurobi 5.0.1 (linux64) logging started Thu Jan 17 23:43:55 2013

Optimize a model with 400 rows, 4220 columns and 8760 nonzeros
Presolve removed 20 rows and 20 columns
Presolve time: 0.01s
Presolved: 380 rows, 4200 columns, 8640 nonzeros
Variable types: 4140 continuous, 60 integer (60 binary)

Root relaxation: objective 3.839329e+04, 434 iterations, 0.01 seconds

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

     0     0 38393.2919    0    4          - 38393.2919     -      -    0s
     0     0 38444.4557    0    6          - 38444.4557     -      -    0s
     0     0 38461.7711    0    7          - 38461.7711     -      -    0s
     0     0 38462.4496    0    7          - 38462.4496     -      -    0s
     0     0 38464.3981    0    7          - 38464.3981     -      -    0s
     0     0 38480.7373    0    7          - 38480.7373     -      -    0s
     0     0 38482.9373    0    6          - 38482.9373     -      -    0s
     0     0 38482.9373    0    7          - 38482.9373     -      -    0s
     0     0 38483.4706    0    7          - 38483.4706     -      -    0s
     0     0 38483.4706    0    7          - 38483.4706     -      -    0s
H    0     0                    41951.600963 38483.4706  8.27%     -    0s
     0     2 38488.3213    0    7 41951.6010 38488.3213  8.26%     -    0s
*   10     4              10    38632.970298 38532.1882  0.26%  19.6    0s

Cutting planes:
  Flow cover: 13

Explored 13 nodes (883 simplex iterations) in 0.22 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 3.863297029776e+04, best bound 3.863124226495e+04, gap 0.0045%