subtract 10%iles      0.00000    0.0197845    0.0995474     0.183611
     0.289015     0.440097     0.686909      1.12506      2.10097
diff 10%iles    -0.489944    -0.201397   -0.0834451   -0.0173316      0.00000
    0.0194445    0.0867174     0.206119     0.495795
stardiff 10%iles   -0.0668609   -0.0240510  -0.00691993      0.00000
   0.00145318    0.0110705    0.0238484    0.0444513    0.0907770
stardiff contour -excluded 0.005   -0.0668609    0.0907770