subtract 10%iles      0.00000   0.00878906    0.0759902     0.153026
     0.246180     0.379026     0.604709      1.02267      1.95559
diff 10%iles    -0.493232    -0.197806   -0.0811837   -0.0167513      0.00000
    0.0198817    0.0865870     0.206211     0.503836
stardiff 10%iles   -0.0762206   -0.0272496  -0.00763416      0.00000
   0.00147670    0.0121556    0.0262611    0.0495813     0.102969
stardiff contour -excluded 0.005   -0.0762206     0.102969