subtract 10%iles  0.000840187    0.0172157    0.0319939    0.0481977
    0.0677452    0.0931273     0.128746     0.185242     0.301281
diff 10%iles    -0.118633   -0.0592301   -0.0322609   -0.0142348  0.000757217
    0.0157845    0.0338364    0.0607910     0.119626
stardiff 10%iles   -0.0330713   -0.0176030  -0.00923016  -0.00291317
   0.00268079   0.00823084    0.0144120    0.0224488    0.0368725
stardiff contour -excluded 0.005   -0.0330713    0.0368725