Gurobi 5.0.1 (linux64) logging started Mon Feb  4 16:00:51 2013

Optimize a model with 340 rows, 1547 columns and 55022 nonzeros
Presolve removed 64 rows and 167 columns
Presolve time: 0.20s
Presolved: 276 rows, 1380 columns, 48915 nonzeros
Variable types: 0 continuous, 1380 integer (1380 binary)
Found heuristic solution: objective 753.0000000
Found heuristic solution: objective 735.0000000

Root relaxation: objective 6.175000e+02, 132 iterations, 0.00 seconds

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

     0     0  617.50000    0   10  735.00000  617.50000  16.0%     -    0s
H    0     0                     668.0000000  617.50000  7.56%     -    0s
*    0     0               0     639.0000000  639.00000   0.0%     -    0s

Cutting planes:
  Gomory: 1
  Clique: 3
  Zero half: 3

Explored 0 nodes (208 simplex iterations) in 0.26 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.390000000000e+02, best bound 6.390000000000e+02, gap 0.0%