subtract 10%iles  0.000797033    0.0312121    0.0594676    0.0896807
     0.124256     0.166406     0.222054     0.305456     0.474453
diff 10%iles    -0.195078   -0.0997810   -0.0551405   -0.0246859  0.000849247
    0.0263729    0.0567808     0.101180     0.195519
stardiff 10%iles   -0.0478064   -0.0241001   -0.0119066  -0.00303735
   0.00465334    0.0122133    0.0206640    0.0318436    0.0524988
stardiff contour -excluded 0.005   -0.0478064    0.0524988