subtract 10%iles      0.00000    0.0228872     0.107825     0.196301
     0.311362     0.475780     0.730902      1.17336      2.16790
diff 10%iles    -0.461365    -0.196675   -0.0853133   -0.0195053      0.00000
    0.0166144    0.0807347     0.190479     0.451659
stardiff 10%iles   -0.0662010   -0.0248300  -0.00815058      0.00000
  0.000189990   0.00915983    0.0202425    0.0373591    0.0769643
stardiff contour -excluded 0.005   -0.0662010    0.0769643