Gurobi 5.0.1 (linux64) logging started Mon Feb  4 18:54:24 2013

Optimize a model with 19649 rows, 2401 columns and 60025 nonzeros
Presolve removed 2525 rows and 1234 columns
Presolve time: 0.13s
Presolved: 17124 rows, 1167 columns, 52292 nonzeros
Variable types: 20 continuous, 1147 integer (1147 binary)
Found heuristic solution: objective 60051.000000

Root relaxation: objective 4.856600e+04, 4385 iterations, 0.21 seconds

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

     0     0 48566.0000    0    8 60051.0000 48566.0000  19.1%     -    0s
H    0     0                    48577.000000 48566.0000  0.02%     -    0s
H    0     0                    48571.000000 48566.0000  0.01%     -    0s
H    0     0                    48570.000000 48566.0000  0.01%     -    0s

Explored 0 nodes (4400 simplex iterations) in 0.42 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 4.857000000000e+04, best bound 4.856600000000e+04, gap 0.0082%