subtract 10%iles      0.00000    0.0250559     0.111640     0.201482
     0.316508     0.481018     0.736520      1.18047      2.17782
diff 10%iles    -0.497051    -0.209829   -0.0903358   -0.0205956      0.00000
    0.0176010    0.0861108     0.204432     0.489079
stardiff 10%iles   -0.0705985   -0.0260482  -0.00850451      0.00000
  0.000184417   0.00973539    0.0218262    0.0408338    0.0844744
stardiff contour -excluded 0.005   -0.0705985    0.0844744