subtract 10%iles   -0.0464395      0.00000    0.0276270     0.114608
     0.214814     0.353415     0.581378      1.01284      2.06463
diff 10%iles    -0.476331    -0.203012   -0.0882187   -0.0209126      0.00000
    0.0162954    0.0820484     0.192798     0.459390
stardiff 10%iles   -0.0741371   -0.0288849   -0.0106684 -0.000162793
      0.00000   0.00728780    0.0183781    0.0356743    0.0762088
stardiff contour -excluded 0.005   -0.0741371    0.0762088