subtract 10%iles   -0.0177374      0.00000   0.00293684    0.0289712
    0.0638299     0.112535     0.187535     0.321574     0.651519
diff 10%iles    -0.266139    -0.106364   -0.0442810   -0.0101538      0.00000
   0.00816596    0.0411215     0.102117     0.261764
stardiff 10%iles   -0.0404880   -0.0140166  -0.00410129      0.00000
  0.000524342   0.00574150    0.0123233    0.0228623    0.0477039
stardiff contour -excluded 0.005   -0.0404880    0.0477039