Gurobi 5.0.1 (linux64) logging started Mon Feb  4 19:01:01 2013

Optimize a model with 47971 rows, 4356 columns and 145926 nonzeros
Presolve removed 5561 rows and 2242 columns
Presolve time: 0.39s
Presolved: 42410 rows, 2114 columns, 128739 nonzeros
Variable types: 24 continuous, 2090 integer (2090 binary)
Found heuristic solution: objective 89412.000000

Root relaxation: objective 6.836077e+04, 9899 iterations, 0.80 seconds

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

     0     0 68360.7727    0   10 89412.0000 68360.7727  23.5%     -    1s
H    0     0                    68376.000000 68360.7727  0.02%     -    1s
H    0     0                    68370.000000 68360.7727  0.01%     -    1s
     0     0 68361.2727    0   15 68370.0000 68361.2727  0.01%     -    1s
     0     0 68361.2727    0    9 68370.0000 68361.2727  0.01%     -    1s
H    0     0                    68368.000000 68361.2727  0.01%     -    2s

Explored 0 nodes (11706 simplex iterations) in 2.00 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.836800000000e+04, best bound 6.836200000000e+04, gap 0.0088%