subtract 10%iles      0.00000    0.0319445     0.114710     0.204636
     0.316837     0.476086     0.734496      1.19548      2.21890
diff 10%iles    -0.451726    -0.188942   -0.0799799   -0.0185990      0.00000
    0.0161991    0.0793805     0.189164     0.449101
stardiff 10%iles   -0.0657477   -0.0247941  -0.00824041      0.00000
  0.000328675   0.00948904    0.0213072    0.0402153    0.0831693
stardiff contour -excluded 0.005   -0.0657477    0.0831693