subtract 10%iles      0.00000  0.000186920    0.0235164    0.0521669
    0.0869741     0.134488     0.206213     0.329182     0.625521
diff 10%iles    -0.232830   -0.0915949   -0.0383072  -0.00864291      0.00000
   0.00776970    0.0369215    0.0894709     0.230129
stardiff 10%iles   -0.0337491   -0.0109861  -0.00253448      0.00000
   0.00143155   0.00625562    0.0122742    0.0218416    0.0441915
stardiff contour -excluded 0.005   -0.0337491    0.0441915