subtract 10%iles      0.00000      0.00000    0.0185760    0.0414324
    0.0684564     0.104182     0.157389     0.252098     0.497263
diff 10%iles    -0.193969   -0.0749426   -0.0318244  -0.00763321      0.00000
   0.00631189    0.0307347    0.0741856     0.193593
stardiff 10%iles   -0.0269162  -0.00912302  -0.00248193      0.00000
  0.000955519   0.00500510   0.00994434    0.0175884    0.0364653
stardiff contour -excluded 0.005   -0.0269162    0.0364653