subtract 10%iles      0.00000      0.00000    0.0188370    0.0413513
    0.0681924     0.103618     0.156158     0.249367     0.489669
diff 10%iles    -0.189443   -0.0728722   -0.0312352  -0.00758362      0.00000
   0.00604916    0.0296812    0.0716171     0.187699
stardiff 10%iles   -0.0267656  -0.00918097  -0.00258399      0.00000
  0.000816084   0.00480209   0.00961291    0.0170209    0.0351385
stardiff contour -excluded 0.005   -0.0267656    0.0351384