subtract 10%iles      0.00000  0.000962608    0.0239749    0.0490839
    0.0777758     0.115900     0.172533     0.272408     0.526386
diff 10%iles    -0.203241   -0.0791419   -0.0337267  -0.00831819      0.00000
   0.00640082    0.0319574    0.0778413     0.203104
stardiff 10%iles   -0.0292698   -0.0102548  -0.00304277      0.00000
  0.000631588   0.00486799    0.0100869    0.0182280    0.0382741
stardiff contour -excluded 0.005   -0.0292698    0.0382741