subtract 10%iles  -0.00183117      0.00000    0.0161717    0.0439672
    0.0785589     0.125999     0.198841     0.325613     0.630014
diff 10%iles    -0.240315   -0.0948610   -0.0397053  -0.00922871      0.00000
   0.00756335    0.0375767    0.0919766     0.237414
stardiff 10%iles   -0.0345843   -0.0114608  -0.00295622      0.00000
   0.00103342   0.00569981    0.0115867    0.0210586    0.0437675
stardiff contour -excluded 0.005   -0.0345843    0.0437675