subtract 10%iles  -0.00142765      0.00000    0.0170346    0.0447425
    0.0781372     0.121962     0.186102     0.298168     0.578631
diff 10%iles    -0.223055   -0.0894053   -0.0386581  -0.00941801      0.00000
   0.00715160    0.0358579    0.0860310     0.219848
stardiff 10%iles   -0.0336680   -0.0116870  -0.00349244      0.00000
  0.000482025   0.00491957    0.0104321    0.0191322    0.0405028
stardiff contour -excluded 0.005   -0.0336680    0.0405028