subtract 10%iles      0.00000  0.000641346    0.0213569    0.0447388
    0.0728271     0.109836     0.163731     0.256488     0.496107
diff 10%iles    -0.191235   -0.0739784   -0.0317378  -0.00790668      0.00000
   0.00590682    0.0299165    0.0723717     0.189436
stardiff 10%iles   -0.0280354  -0.00961870  -0.00280422      0.00000
  0.000678509   0.00472482   0.00970216    0.0174884    0.0367408
stardiff contour -excluded 0.005   -0.0280354    0.0367408