Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:08:45 2013

Optimize a model with 68 rows, 2066 columns and 24148 nonzeros
Presolve removed 22 rows and 23 columns
Presolve time: 0.08s
Presolved: 46 rows, 2043 columns, 22104 nonzeros
Variable types: 2023 continuous, 20 integer (20 binary)

Root relaxation: objective 7.444602e+03, 12 iterations, 0.00 seconds

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

     0     0 7444.60178    0    3          - 7444.60178     -      -    0s
     0     0 7445.48886    0    3          - 7445.48886     -      -    0s
     0     0 7456.82887    0    3          - 7456.82887     -      -    0s
     0     0 7458.29168    0    3          - 7458.29168     -      -    0s
     0     0 7458.85459    0    3          - 7458.85459     -      -    0s
     0     0 7459.10701    0    3          - 7459.10701     -      -    0s
     0     0 7459.10701    0    3          - 7459.10701     -      -    0s
     0     0 7459.10701    0    3          - 7459.10701     -      -    0s
     0     0 7459.10927    0    4          - 7459.10927     -      -    0s
     0     0 7459.11000    0    6          - 7459.11000     -      -    0s
     0     0 7459.11075    0    6          - 7459.11075     -      -    0s
     0     0 7459.11075    0    6          - 7459.11075     -      -    0s
     0     2 7459.11360    0    6          - 7459.11360     -      -    0s
*    5     4               5    7459.1542398 7459.12220  0.00%   3.8    0s

Cutting planes:
  Cover: 1
  Implied bound: 2
  Flow cover: 3

Explored 6 nodes (127 simplex iterations) in 0.79 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 7.459154239753e+03, best bound 7.459122200197e+03, gap 0.0004%