subtract 10%iles  0.000464439    0.0220757    0.0418358    0.0634594
    0.0889397     0.120979     0.165157     0.234912     0.382887
diff 10%iles    -0.148831   -0.0740285   -0.0402327   -0.0177832  0.000806332
    0.0193996    0.0418568    0.0755401     0.149748
stardiff 10%iles   -0.0371532   -0.0194476   -0.0100355  -0.00300830
   0.00318158   0.00931324    0.0161401    0.0250622    0.0412039
stardiff contour -excluded 0.005   -0.0371532    0.0412039