subtract 10%iles      0.00000    0.0129769    0.0967560     0.185717
     0.300575     0.465847     0.720601      1.16614      2.17476
diff 10%iles    -0.470189    -0.199260   -0.0858505   -0.0202297      0.00000
    0.0161722    0.0813439     0.192602     0.459116
stardiff 10%iles   -0.0733519   -0.0275593  -0.00923930      0.00000
      0.00000   0.00929709    0.0212150    0.0399953    0.0830917
stardiff contour -excluded 0.005   -0.0733519    0.0830917