subtract 10%iles  -0.00143310      0.00000    0.0185828    0.0486591
    0.0850208     0.133371     0.204455     0.326949     0.624410
diff 10%iles    -0.240560   -0.0976925   -0.0421464   -0.0100598      0.00000
   0.00797868    0.0392027    0.0935931     0.236444
stardiff 10%iles   -0.0352090   -0.0121292  -0.00345137      0.00000
  0.000681501   0.00535099    0.0111424    0.0203339    0.0425204
stardiff contour -excluded 0.005   -0.0352090    0.0425204