subtract 10%iles -2.39611e-05      0.00000    0.0154479    0.0378828
    0.0649524     0.101191     0.155446     0.252429     0.501741
diff 10%iles    -0.195292   -0.0757465   -0.0322559  -0.00766611      0.00000
   0.00632954    0.0307410    0.0739264     0.193269
stardiff 10%iles   -0.0275231  -0.00934210  -0.00248096      0.00000
  0.000995304   0.00503412    0.0100060    0.0177660    0.0366578
stardiff contour -excluded 0.005   -0.0275231    0.0366578