subtract 10%iles  -0.00251245      0.00000    0.0132582    0.0369282
    0.0663240     0.106879     0.168621     0.278229     0.554784
diff 10%iles    -0.216834   -0.0847611   -0.0358136  -0.00846982      0.00000
   0.00670338    0.0335274    0.0818336     0.213322
stardiff 10%iles   -0.0306131   -0.0101689  -0.00273118      0.00000
  0.000919998   0.00522044    0.0105627    0.0190166    0.0394327
stardiff contour -excluded 0.005   -0.0306131    0.0394327