subtract 10%iles      0.00000    0.0144689     0.101662     0.191141
     0.301502     0.456509     0.699986      1.13238      2.13361
diff 10%iles    -0.468166    -0.199299   -0.0857768   -0.0192528      0.00000
    0.0176544    0.0829096     0.193762     0.458642
stardiff 10%iles   -0.0693587   -0.0262291  -0.00843492      0.00000
  0.000256893   0.00957930    0.0211813    0.0393578    0.0806644
stardiff contour -excluded 0.005   -0.0693587    0.0806643