subtract 10%iles      0.00000    0.0160067    0.0861583     0.160333
     0.255169     0.395154     0.629612      1.05704      2.01194
diff 10%iles    -0.430931    -0.178275   -0.0757537   -0.0189095      0.00000
    0.0137386    0.0729713     0.177552     0.428623
stardiff 10%iles   -0.0670376   -0.0264011  -0.00989230      0.00000
      0.00000   0.00832063    0.0202389    0.0386405    0.0803447
stardiff contour -excluded 0.005   -0.0670376    0.0803446