subtract 10%iles -0.000187635    0.0139523    0.0267715    0.0407820
    0.0574951    0.0789452     0.108984     0.157691     0.264172
diff 10%iles    -0.109108   -0.0533104   -0.0288997   -0.0128250  0.000493526
    0.0137672    0.0296798    0.0536680     0.108036
stardiff 10%iles   -0.0336077   -0.0176831  -0.00934786  -0.00311614
   0.00238154   0.00782266    0.0138650    0.0217423    0.0360739
stardiff contour -excluded 0.005   -0.0336077    0.0360738