subtract 10%iles  -0.00176287    0.0120840    0.0256920    0.0415368
    0.0612764    0.0873489     0.124332     0.183798     0.311314
diff 10%iles    -0.158575   -0.0765424   -0.0398798   -0.0171995  0.000342131
    0.0177488    0.0401745    0.0762994     0.157252
stardiff 10%iles   -0.0395685   -0.0193603  -0.00969177  -0.00279817
   0.00314478   0.00899113    0.0155975    0.0246633    0.0425839
stardiff contour -excluded 0.005   -0.0395685    0.0425838