subtract 10%iles      0.00000  0.000619719    0.0250496    0.0554342
    0.0913104     0.136597     0.200074     0.304196     0.546743
stardiff 10%iles    -0.203257   -0.0882885   -0.0408060   -0.0120001
      0.00000   0.00391696    0.0311015    0.0777178     0.193910
stardiff contour -excluded 0.005    -0.203257     0.193910