Gurobi 5.0.1 (linux64) logging started Wed Dec 19 18:35:41 2012

Optimize a model with 3842 rows, 3721 columns and 22262 nonzeros
Presolve removed 2242 rows and 2462 columns
Presolve time: 0.07s
Presolved: 1600 rows, 1259 columns, 12413 nonzeros
Variable types: 52 continuous, 1207 integer (1207 binary)

Root relaxation: objective 5.933453e+02, 251 iterations, 0.01 seconds

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

     0     0  593.34533    0   56          -  593.34533     -      -    0s
     0     0  606.50000    0   28          -  606.50000     -      -    0s
H    0     0                     624.0000000  606.50000  2.80%     -    0s
     0     0  609.09091    0   22  624.00000  609.09091  2.39%     -    0s
     0     0  609.09091    0   58  624.00000  609.09091  2.39%     -    0s
H    0     0                     616.0000000  609.09091  1.12%     -    0s
     0     0  610.10106    0   26  616.00000  610.10106  0.96%     -    0s
     0     0  611.95984    0   54  616.00000  611.95984  0.66%     -    0s
     0     1  613.45984    0   54  616.00000  613.45984  0.41%     -    0s

Explored 3 nodes (809 simplex iterations) in 0.33 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.160000000000e+02, best bound 6.160000000000e+02, gap 0.0%