Gurobi 5.0.1 (linux64) logging started Mon Feb  4 19:00:40 2013

Optimize a model with 45825 rows, 4225 columns and 139425 nonzeros
Presolve removed 4608 rows and 2155 columns
Presolve time: 0.37s
Presolved: 41217 rows, 2070 columns, 125567 nonzeros
Variable types: 31 continuous, 2039 integer (2039 binary)
Found heuristic solution: objective 90717.000000

Root relaxation: objective 6.837194e+04, 13660 iterations, 1.11 seconds

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

     0     0 68371.9375    0    8 90717.0000 68371.9375  24.6%     -    1s
H    0     0                    68385.000000 68371.9375  0.02%     -    1s
     0     0 68372.7778    0   12 68385.0000 68372.7778  0.02%     -    1s
     0     0 68372.7778    0    9 68385.0000 68372.7778  0.02%     -    2s
H    0     0                    68384.000000 68372.7778  0.02%     -    2s
H    0     0                    68383.000000 68372.7778  0.01%     -    2s
     0     0 68372.7778    0   16 68383.0000 68372.7778  0.01%     -    2s
     0     2 68372.9181    0   11 68383.0000 68372.9181  0.01%     -    2s
H   14    10                    68380.000000 68374.3344  0.01%   1.4    2s

Cutting planes:
  Gomory: 5
  MIR: 11
  Zero half: 2

Explored 14 nodes (15768 simplex iterations) in 2.43 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.838000000000e+04, best bound 6.837500000000e+04, gap 0.0073%