subtract 10%iles      0.00000    0.0236254     0.110765     0.201271
     0.317363     0.481837     0.735960      1.17970      2.18223
diff 10%iles    -0.466244    -0.198363   -0.0857582   -0.0193863      0.00000
    0.0171726    0.0822288     0.192895     0.457739
stardiff 10%iles   -0.0685293   -0.0255089  -0.00834507      0.00000
  0.000217251   0.00953411    0.0211781    0.0393465    0.0810778
stardiff contour -excluded 0.005   -0.0685293    0.0810778