subtract 10%iles      0.00000    0.0144372    0.0995407     0.188875
     0.300539     0.461131     0.708688      1.14348      2.13479
diff 10%iles    -0.468674    -0.198150   -0.0845766   -0.0186801      0.00000
    0.0180149    0.0832863     0.194779     0.461739
stardiff 10%iles   -0.0687056   -0.0252042  -0.00759318      0.00000
  0.000855893    0.0103934    0.0222274    0.0409563    0.0836554
stardiff contour -excluded 0.005   -0.0687056    0.0836553