subtract 10%iles  0.000315189    0.0164366    0.0302615    0.0446272
    0.0611725    0.0820675     0.111221     0.158076     0.257134
diff 10%iles   -0.0803018   -0.0433569   -0.0247898   -0.0112710  0.000548363
    0.0123711    0.0259013    0.0444393    0.0811367
stardiff 10%iles   -0.0391403   -0.0216984   -0.0118480  -0.00428168
   0.00246870   0.00917704    0.0165875    0.0260351    0.0421758
stardiff contour -excluded 0.005   -0.0391403    0.0421758