subtract 10%iles      0.00000  0.000267379    0.0205464    0.0435982
    0.0711315     0.107772     0.161685     0.255126     0.493297
diff 10%iles    -0.190215   -0.0732448   -0.0313334  -0.00757790      0.00000
   0.00615668    0.0299616    0.0721560     0.188645
stardiff 10%iles   -0.0268079  -0.00916597  -0.00259791      0.00000
  0.000778519   0.00470443   0.00948516    0.0169368    0.0352300
stardiff contour -excluded 0.005   -0.0268079    0.0352299