Gurobi 5.0.1 (linux64) logging started Mon Feb  4 19:01:46 2013

Optimize a model with 50183 rows, 4489 columns and 152626 nonzeros
Presolve removed 4200 rows and 2275 columns
Presolve time: 0.38s
Presolved: 45983 rows, 2214 columns, 140125 nonzeros
Variable types: 34 continuous, 2180 integer (2180 binary)
Found heuristic solution: objective 94930.000000

Root relaxation: objective 6.933862e+04, 22622 iterations, 2.48 seconds

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

     0     0 69338.6250    0   13 94930.0000 69338.6250  27.0%     -    3s
H    0     0                    69359.000000 69338.6250  0.03%     -    3s
H    0     0                    69357.000000 69338.6250  0.03%     -    3s
     0     0 69340.0814    0   27 69357.0000 69340.0814  0.02%     -    3s
     0     0 69340.0814    0    9 69357.0000 69340.0814  0.02%     -    3s
H    0     0                    69352.000000 69340.0814  0.02%     -    3s
H    0     0                    69349.000000 69340.0814  0.01%     -    3s
     0     0 69341.2769    0   34 69349.0000 69341.2769  0.01%     -    3s
     0     2 69341.7729    0   34 69349.0000 69341.7729  0.01%     -    3s

Cutting planes:
  Gomory: 12
  MIR: 22
  Zero half: 1

Explored 5 nodes (26119 simplex iterations) in 3.97 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.934900000000e+04, best bound 6.934300000000e+04, gap 0.0087%