subtract 10%iles      0.00000    0.0130484    0.0813196     0.155629
     0.249665     0.387333     0.606278     0.998200      1.92354
diff 10%iles    -0.417522    -0.179984   -0.0777893   -0.0179722      0.00000
    0.0144384    0.0720100     0.172030     0.409354
stardiff 10%iles   -0.0599720   -0.0223075  -0.00702276      0.00000
  0.000222356   0.00792395    0.0175488    0.0324673    0.0659251
stardiff contour -excluded 0.005   -0.0599720    0.0659250