Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:07:36 2013

Optimize a model with 4028 rows, 4044 columns and 16082 nonzeros
Presolve removed 2086 rows and 2085 columns
Presolve time: 0.10s
Presolved: 1942 rows, 1959 columns, 5854 nonzeros
Variable types: 991 continuous, 968 integer (968 binary)

Root relaxation: objective 7.444602e+03, 781 iterations, 0.02 seconds

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

     0     0 7444.60178    0    1          - 7444.60178     -      -    0s
H    0     0                    7459.1542398 7444.60178  0.20%     -    0s
     0     0 7459.15254    0    2 7459.15424 7459.15254  0.00%     -    0s

Cutting planes:
  Implied bound: 1
  Flow cover: 2

Explored 0 nodes (809 simplex iterations) in 0.15 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.459154239754e+03, best bound 7.459152541190e+03, gap 0.0000%