subtract 10%iles      0.00000   0.00190600    0.0230156    0.0455921
    0.0727124     0.108604     0.161591     0.254740     0.493209
diff 10%iles    -0.189383   -0.0742378   -0.0322871  -0.00828958      0.00000
   0.00554776    0.0293417    0.0711281     0.186197
stardiff 10%iles   -0.0286646   -0.0102510  -0.00321551      0.00000
  0.000367850   0.00442554   0.00937048    0.0169644    0.0351603
stardiff contour -excluded 0.005   -0.0286646    0.0351603