subtract 10%iles      0.00000    0.0176735     0.101799     0.190448
     0.305825     0.470873     0.726118      1.16802      2.15926
diff 10%iles    -0.481080    -0.204378   -0.0881577   -0.0197463      0.00000
    0.0176697    0.0843215     0.198855     0.472989
stardiff 10%iles   -0.0672133   -0.0249574  -0.00791585      0.00000
  0.000471205   0.00969887    0.0210696    0.0387353    0.0794460
stardiff contour -excluded 0.005   -0.0672133    0.0794458