subtract 10%iles -0.000331879    0.0121737    0.0239563    0.0369029
    0.0523014    0.0722275     0.100965     0.150008     0.270064
diff 10%iles    -0.128061   -0.0589867   -0.0313644   -0.0138483  0.000429153
    0.0146940    0.0321865    0.0597630     0.128311
stardiff 10%iles   -0.0352407   -0.0174629  -0.00875489  -0.00248809
   0.00295451   0.00835696    0.0144887    0.0228937    0.0397693
stardiff contour -excluded 0.005   -0.0352407    0.0397693