subtract 10%iles      0.00000   0.00217462    0.0269327    0.0539012
    0.0867054     0.132102     0.201011     0.321168     0.616376
diff 10%iles    -0.231784   -0.0916946   -0.0388961  -0.00953674      0.00000
   0.00669599    0.0351744    0.0869312     0.226588
stardiff 10%iles   -0.0358285   -0.0129956  -0.00407802      0.00000
  0.000389334   0.00533717    0.0113517    0.0206636    0.0432796
stardiff contour -excluded 0.005   -0.0358285    0.0432795