subtract 10%iles      0.00000    0.0202658     0.106993     0.199257
     0.317862     0.484720     0.743721      1.19710      2.20323
diff 10%iles    -0.471383    -0.199977   -0.0866818   -0.0195708      0.00000
    0.0176747    0.0836470     0.195442     0.463388
stardiff 10%iles   -0.0665698   -0.0246379  -0.00768447      0.00000
  0.000616971   0.00984509    0.0211632    0.0389241    0.0799723
stardiff contour -excluded 0.005   -0.0665698    0.0799723