Gurobi 5.0.1 (linux64) logging started Mon Feb  4 16:17:40 2013

Optimize a model with 837 rows, 13354 columns and 538995 nonzeros
Presolve removed 31 rows and 157 columns
Presolve time: 2.44s
Presolved: 806 rows, 13197 columns, 532470 nonzeros
Variable types: 0 continuous, 13197 integer (13197 binary)
Found heuristic solution: objective 6427.0000000

Root relaxation: objective 4.554500e+03, 2675 iterations, 0.63 seconds

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

     0     0 4554.50000    0   28 6427.00000 4554.50000  29.1%     -    3s
H    0     0                    4588.0000000 4554.50000  0.73%     -    3s
*    0     0               0    4555.0000000 4555.00000   0.0%     -    3s

Cutting planes:
  Clique: 3
  Zero half: 2

Explored 0 nodes (2775 simplex iterations) in 3.72 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.555000000000e+03, best bound 4.555000000000e+03, gap 0.0%