subtract 10%iles  -0.00157976      0.00000    0.0195031    0.0517266
    0.0921156     0.149143     0.237170     0.389419     0.743723
diff 10%iles    -0.287400    -0.116216   -0.0486262   -0.0117500      0.00000
   0.00793028    0.0433710     0.109048     0.278397
stardiff 10%iles   -0.0434543   -0.0154374  -0.00468160      0.00000
  0.000252840   0.00563984    0.0125259    0.0235653    0.0492517
stardiff contour -excluded 0.005   -0.0434543    0.0492517