subtract 10%iles      0.00000      0.00000    0.0173283    0.0400636
    0.0681921     0.106485     0.163903     0.265048     0.520521
diff 10%iles    -0.199779   -0.0778215   -0.0331486  -0.00805485      0.00000
   0.00611281    0.0309758    0.0751553     0.196781
stardiff 10%iles   -0.0291243  -0.00991016  -0.00282976      0.00000
  0.000725891   0.00488623    0.0100127    0.0180381    0.0376997
stardiff contour -excluded 0.005   -0.0291243    0.0376997