Gurobi 5.0.1 (linux64) logging started Wed Apr 24 01:37:07 2013

Optimize a model with 671 rows, 37271 columns and 74481 nonzeros
Presolve time: 0.05s
Presolved: 671 rows, 37271 columns, 74481 nonzeros
Variable types: 37210 continuous, 61 integer (61 binary)

Root relaxation: objective 6.928956e+04, 1506 iterations, 0.04 seconds

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

     0     0 69289.5592    0    6          - 69289.5592     -      -    0s
H    0     0                    69954.000000 69289.5592  0.95%     -    0s
     0     0 69692.3677    0    3 69954.0000 69692.3677  0.37%     -    0s
H    0     0                    69797.000000 69692.3677  0.15%     -    0s
     0     0 69712.2748    0    4 69797.0000 69712.2748  0.12%     -    0s
     0     0 69712.2748    0    6 69797.0000 69712.2748  0.12%     -    0s
     0     0 69712.2748    0    3 69797.0000 69712.2748  0.12%     -    0s
     0     0 69713.3473    0    4 69797.0000 69713.3473  0.12%     -    0s
     0     0 69722.9631    0    3 69797.0000 69722.9631  0.11%     -    0s
     0     0 69723.0208    0    3 69797.0000 69723.0208  0.11%     -    0s
     0     0 69723.0208    0    3 69797.0000 69723.0208  0.11%     -    0s
     0     0 69752.4888    0    3 69797.0000 69752.4888  0.06%     -    0s
     0     0 69766.4016    0    2 69797.0000 69766.4016  0.04%     -    0s
     0     1 69782.4128    0    2 69797.0000 69782.4128  0.02%     -    0s

Cutting planes:
  Implied bound: 97
  Flow cover: 1

Explored 2 nodes (3501 simplex iterations) in 0.95 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.979700000000e+04, best bound 6.979400719424e+04, gap 0.0043%