subtract 10%iles  -0.00147843      0.00000    0.0146561    0.0387592
    0.0683317     0.109254     0.171920     0.283390     0.564197
diff 10%iles    -0.219349   -0.0860577   -0.0363945  -0.00872993      0.00000
   0.00658035    0.0336945    0.0827856     0.216416
stardiff 10%iles   -0.0320571   -0.0108315  -0.00306634      0.00000
  0.000723438   0.00513688    0.0106394    0.0193766    0.0407172
stardiff contour -excluded 0.005   -0.0320571    0.0407172