subtract 10%iles      0.00000   0.00121893    0.0400777    0.0879593
     0.146505     0.228045     0.350204     0.547664     0.976495
diff 10%iles    -0.355408    -0.147450   -0.0614772   -0.0140715      0.00000
    0.0107371    0.0562394     0.139864     0.349709
stardiff 10%iles   -0.0563708   -0.0198044  -0.00556466      0.00000
  0.000753087   0.00803223    0.0175922    0.0327616    0.0670244
stardiff contour -excluded 0.005   -0.0563708    0.0670244