subtract 10%iles   0.00133443    0.0182028    0.0329123    0.0483952
    0.0663815    0.0890961     0.120614     0.170613     0.274582
diff 10%iles   -0.0828705   -0.0448027   -0.0255966   -0.0116081  0.000614166
    0.0128350    0.0268159    0.0459900    0.0838451
stardiff 10%iles   -0.0396797   -0.0218310   -0.0118038  -0.00411386
   0.00274288   0.00954831    0.0170605    0.0266536    0.0430902
stardiff contour -excluded 0.005   -0.0396797    0.0430902