subtract 10%iles      0.00000  0.000407156    0.0196390    0.0417283
    0.0685949     0.104461     0.157518     0.250759     0.489904
diff 10%iles    -0.188836   -0.0733473   -0.0316467  -0.00797153      0.00000
   0.00564718    0.0293174    0.0711145     0.186359
stardiff 10%iles   -0.0270450  -0.00962064  -0.00299132      0.00000
  0.000459478   0.00440254   0.00923255    0.0167149    0.0349111
stardiff contour -excluded 0.005   -0.0270450    0.0349110