subtract 10%iles      0.00000    0.0229664     0.110941     0.201699
     0.318948     0.484265     0.739979      1.18912      2.19968
diff 10%iles    -0.468331    -0.199203   -0.0862031   -0.0195801      0.00000
    0.0172129    0.0825520     0.193586     0.458851
stardiff 10%iles   -0.0669436   -0.0246762  -0.00782561      0.00000
  0.000504613   0.00966573    0.0208685    0.0382434    0.0785092
stardiff contour -excluded 0.005   -0.0669436    0.0785091