subtract 10%iles      0.00000    0.0257576     0.112138     0.205894
     0.322626     0.487548     0.751216      1.21796      2.25205
diff 10%iles    -0.454980    -0.191330   -0.0819384   -0.0199041      0.00000
    0.0150123    0.0783920     0.187922     0.447179
stardiff 10%iles   -0.0727628   -0.0278026   -0.0101193      0.00000
      0.00000   0.00827517    0.0208443    0.0410403    0.0862594
stardiff contour -excluded 0.005   -0.0727628    0.0862592