subtract 10%iles      0.00000  0.000386998    0.0267715    0.0576150
    0.0950880     0.145874     0.221030     0.351003     0.663544
diff 10%iles    -0.242484   -0.0948664   -0.0395463  -0.00899506      0.00000
   0.00828934    0.0391047    0.0954727     0.246123
stardiff 10%iles   -0.0383556   -0.0124992  -0.00345960      0.00000
  0.000935644   0.00616314    0.0127963    0.0236527    0.0512129
stardiff contour -excluded 0.005   -0.0383556    0.0512127