subtract 10%iles  -0.00216222   0.00886416    0.0189490    0.0304520
    0.0451779    0.0659313    0.0981598     0.155708     0.297975
diff 10%iles    -0.123609   -0.0546842   -0.0279932   -0.0122330  0.000153542
    0.0125308    0.0282893    0.0551357     0.124349
stardiff 10%iles   -0.0370600   -0.0181349  -0.00942310  -0.00316819
   0.00230307   0.00776700    0.0140264    0.0227949    0.0418696
stardiff contour -excluded 0.005   -0.0370600    0.0418696