subtract 10%iles -0.000767231   0.00756073    0.0152607    0.0239220
    0.0347843    0.0497799    0.0727978     0.113849     0.215820
diff 10%iles    -0.107014   -0.0463600   -0.0234127   -0.0100422  0.000442773
    0.0109341    0.0243149    0.0471823     0.107391
stardiff 10%iles   -0.0302965   -0.0148310  -0.00752257  -0.00224640
   0.00238462   0.00703940    0.0123948    0.0198935    0.0355240
stardiff contour -excluded 0.005   -0.0302965    0.0355240