subtract 10%iles      0.00000   0.00123835    0.0225747    0.0464187
    0.0751765     0.114108     0.172178     0.275205     0.537315
diff 10%iles    -0.237803   -0.0916860   -0.0385003  -0.00926018      0.00000
   0.00695419    0.0359378    0.0887256     0.234973
stardiff 10%iles   -0.0313437   -0.0108307  -0.00316624      0.00000
  0.000706614   0.00516490    0.0106595    0.0193274    0.0402221
stardiff contour -excluded 0.005   -0.0313437    0.0402220