subtract 10%iles      0.00000   0.00202869    0.0400521    0.0849848
     0.141547     0.220244     0.340988     0.549930      1.02468
diff 10%iles    -0.308366    -0.131586   -0.0568492   -0.0135852      0.00000
   0.00980449    0.0506225     0.122143     0.297258
stardiff 10%iles   -0.0453533   -0.0164342  -0.00495982      0.00000
  0.000348516   0.00605071    0.0132234    0.0245236    0.0504033
stardiff contour -excluded 0.005   -0.0453533    0.0504032