subtract 10%iles  -0.00578690      0.00000   0.00959134    0.0325708
    0.0616449     0.101284     0.161429     0.268251     0.539428
diff 10%iles    -0.212391   -0.0831213   -0.0351832  -0.00843239      0.00000
   0.00640690    0.0325787    0.0797501     0.208831
stardiff 10%iles   -0.0306381   -0.0103909  -0.00291183      0.00000
  0.000752950   0.00502861    0.0103292    0.0186989    0.0390581
stardiff contour -excluded 0.005   -0.0306381    0.0390581