subtract 10%iles      0.00000    0.0220869     0.109215     0.201082
     0.319429     0.485530     0.744062      1.19930      2.20698
diff 10%iles    -0.469187    -0.199070   -0.0860865   -0.0191927      0.00000
    0.0179863    0.0837097     0.195539     0.462862
stardiff 10%iles   -0.0660208   -0.0241339  -0.00738627      0.00000
  0.000786996    0.0100220    0.0213274    0.0390195    0.0798479
stardiff contour -excluded 0.005   -0.0660208    0.0798479