subtract 10%iles -0.000115395    0.0171566    0.0331440    0.0508423
    0.0720894    0.0992241     0.136786     0.196320     0.318673
diff 10%iles    -0.128562   -0.0640821   -0.0347672   -0.0152931  0.000839233
    0.0169601    0.0364442    0.0657139     0.129822
stardiff 10%iles   -0.0356228   -0.0187267  -0.00974045  -0.00302893
   0.00287917   0.00873056    0.0152447    0.0237547    0.0392286
stardiff contour -excluded 0.005   -0.0356228    0.0392286