subtract 10%iles      0.00000      0.00000    0.0158017    0.0386314
    0.0661234     0.102840     0.156876     0.251518     0.489245
diff 10%iles    -0.188722   -0.0727043   -0.0310235  -0.00740337      0.00000
   0.00621033    0.0298027    0.0715361     0.186992
stardiff 10%iles   -0.0260032  -0.00873504  -0.00236190      0.00000
  0.000920027   0.00480080   0.00955054    0.0169176    0.0348118
stardiff contour -excluded 0.005   -0.0260032    0.0348117