subtract 10%iles      0.00000    0.0180707     0.104110     0.198305
     0.318871     0.487991     0.748819      1.20110      2.20624
diff 10%iles    -0.471591    -0.200515   -0.0868690   -0.0195220      0.00000
    0.0177286    0.0837009     0.195199     0.462731
stardiff 10%iles   -0.0649278   -0.0236570  -0.00718856      0.00000
  0.000781789   0.00978276    0.0208696    0.0381891    0.0780559
stardiff contour -excluded 0.005   -0.0649278    0.0780559