subtract 10%iles  -0.00643408      0.00000    0.0122509    0.0388880
    0.0713714     0.114119     0.176473     0.284821     0.563808
diff 10%iles    -0.217367   -0.0867133   -0.0376666  -0.00926447      0.00000
   0.00699449    0.0350904    0.0837897     0.215080
stardiff 10%iles   -0.0342969   -0.0120569  -0.00384872      0.00000
  0.000246862   0.00480905    0.0105216    0.0194475    0.0415629
stardiff contour -excluded 0.005   -0.0342969    0.0415629