Gurobi 5.0.1 (linux64) logging started Mon Feb  4 19:02:25 2013

Optimize a model with 52462 rows, 4624 columns and 159528 nonzeros
Presolve removed 2694 rows and 2306 columns
Presolve time: 0.23s
Presolved: 49768 rows, 2318 columns, 152294 nonzeros
Variable types: 46 continuous, 2272 integer (2272 binary)
Found heuristic solution: objective 103180.00000

Root relaxation: objective 6.955576e+04, 28878 iterations, 2.77 seconds

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

     0     0 69555.7647    0   12 103180.000 69555.7647  32.6%     -    3s
H    0     0                    69573.000000 69555.7647  0.02%     -    3s
H    0     0                    69564.000000 69555.7647  0.01%     -    3s
     0     0 69556.0132    0   41 69564.0000 69556.0132  0.01%     -    3s
     0     0 69556.0132    0   14 69564.0000 69556.0132  0.01%     -    4s
     0     0 69556.0132    0   45 69564.0000 69556.0132  0.01%     -    4s
     0     2 69556.0753    0   45 69564.0000 69556.0753  0.01%     -    4s
H    6     6                    69563.000000 69556.2292  0.01%  11.3    4s

Cutting planes:
  Gomory: 4
  MIR: 7

Explored 6 nodes (33495 simplex iterations) in 4.50 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.956300000000e+04, best bound 6.955700000000e+04, gap 0.0086%