subtract 10%iles      0.00000  0.000468969    0.0225623    0.0471249
    0.0756462     0.113862     0.171132     0.272572     0.530799
diff 10%iles    -0.205667   -0.0796406   -0.0336752  -0.00807548      0.00000
   0.00669885    0.0325681    0.0789967     0.206069
stardiff 10%iles   -0.0292588   -0.0101455  -0.00292561      0.00000
  0.000773740   0.00503511    0.0102497    0.0183839    0.0386587
stardiff contour -excluded 0.005   -0.0292588    0.0386587