Gurobi 5.0.1 (linux64) logging started Fri Jan 18 07:07:37 2013

Optimize a model with 4028 rows, 4044 columns and 16082 nonzeros
Presolve removed 2010 rows and 2019 columns
Presolve time: 0.18s
Presolved: 2018 rows, 2025 columns, 6062 nonzeros
Variable types: 1019 continuous, 1006 integer (1006 binary)

Root relaxation: objective 5.420106e+03, 815 iterations, 0.03 seconds

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

     0     0 5420.10604    0    1          - 5420.10604     -      -    0s
H    0     0                    5441.6179642 5420.10604  0.40%     -    0s
     0     0 5441.61354    0    2 5441.61796 5441.61354  0.00%     -    0s

Cutting planes:
  Implied bound: 1
  Flow cover: 2

Explored 0 nodes (877 simplex iterations) in 0.25 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.441617964219e+03, best bound 5.441613538090e+03, gap 0.0001%