subtract 10%iles      0.00000  0.000593383    0.0263336    0.0554214
    0.0887691     0.131731     0.195724     0.306867     0.586025
diff 10%iles    -0.222270   -0.0869074   -0.0366659  -0.00872254      0.00000
   0.00727558    0.0353341    0.0862935     0.223801
stardiff 10%iles   -0.0359575   -0.0120720  -0.00345955      0.00000
  0.000749797   0.00563910    0.0117659    0.0216518    0.0465586
stardiff contour -excluded 0.005   -0.0359575    0.0465585