Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:23:35 2013

Optimize a model with 51191 rows, 50481 columns and 201711 nonzeros
Presolve removed 2716 rows and 0 columns
Presolve time: 0.32s
Presolved: 48475 rows, 50481 columns, 196279 nonzeros
Variable types: 50410 continuous, 71 integer (71 binary)

Root relaxation: objective 6.902637e+04, 8316 iterations, 1.42 seconds

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

     0     0 69026.3744    0    4          - 69026.3744     -      -    1s
H    0     0                    70196.000000 69026.3744  1.67%     -    2s
     0     0 69027.5664    0    5 70196.0000 69027.5664  1.66%     -    2s
     0     0 69027.5664    0    5 70196.0000 69027.5664  1.66%     -    2s
     0     2 69030.5245    0    5 70196.0000 69030.5245  1.66%     -    4s
H    4     4                    69757.142857 69125.7013  0.91%   116    4s
     7     9 69156.8852    7    2 69757.1429 69125.7013  0.91%   108    5s
H    9     9                    69322.000000 69125.7013  0.28%  93.1    5s
H   12     9                    69261.000000 69125.7013  0.20%  81.1    5s
*   15    11              13    69249.000000 69125.7013  0.18%  73.3    5s
*   25     8               6    69235.000000 69136.7900  0.14%  67.8    5s

Cutting planes:
  Gomory: 2
  Flow cover: 3

Explored 50 nodes (11176 simplex iterations) in 6.50 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.923500000000e+04, best bound 6.923500000000e+04, gap 0.0%