subtract 10%iles      0.00000   0.00161088    0.0280013    0.0580056
    0.0946507     0.145740     0.223948     0.359882     0.681697
diff 10%iles    -0.256494    -0.102222   -0.0426037  -0.00969124      0.00000
   0.00817108    0.0400248    0.0984124     0.251357
stardiff 10%iles   -0.0372871   -0.0124155  -0.00323375      0.00000
   0.00103539   0.00600534    0.0121657    0.0220243    0.0455674
stardiff contour -excluded 0.005   -0.0372871    0.0455674