Gurobi 5.0.1 (linux64) logging started Mon Feb  4 16:15:28 2013

Optimize a model with 809 rows, 11869 columns and 482318 nonzeros
Presolve removed 62 rows and 263 columns
Presolve time: 3.43s
Presolved: 747 rows, 11606 columns, 471317 nonzeros
Variable types: 0 continuous, 11606 integer (11606 binary)
Found heuristic solution: objective 5650.0000000

Root relaxation: objective 4.246000e+03, 2269 iterations, 0.45 seconds

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

     0     0 4246.00000    0   34 5650.00000 4246.00000  24.8%     -    4s
H    0     0                    4507.0000000 4246.00000  5.79%     -    4s
*    0     0               0    4255.0000000 4255.00000   0.0%     -    4s

Cutting planes:
  Clique: 2
  Zero half: 2

Explored 0 nodes (2589 simplex iterations) in 4.81 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.255000000000e+03, best bound 4.255000000000e+03, gap 0.0%