subtract 10%iles  -0.00236559      0.00000    0.0157900    0.0436537
    0.0783226     0.126475     0.200245     0.328972     0.637679
diff 10%iles    -0.243679   -0.0964851   -0.0404058  -0.00952601      0.00000
   0.00742006    0.0377827    0.0930910     0.240137
stardiff 10%iles   -0.0353100   -0.0117130  -0.00316268      0.00000
  0.000899464   0.00570602    0.0118578    0.0217481    0.0451474
stardiff contour -excluded 0.005   -0.0353100    0.0451473