subtract 10%iles      0.00000      0.00000    0.0210073    0.0496234
    0.0825183     0.124523     0.185166     0.287123     0.530087
stardiff 10%iles    -0.199763   -0.0863105   -0.0403391   -0.0121635
      0.00000   0.00478812    0.0322971    0.0782880     0.193996
stardiff contour -excluded 0.005    -0.199763     0.193995