subtract 10%iles      0.00000   0.00852412    0.0682964     0.138393
     0.227043     0.348394     0.555355     0.945483      1.84415
diff 10%iles    -0.400230    -0.164199   -0.0697944   -0.0181101      0.00000
    0.0107483    0.0626912     0.157590     0.394748
stardiff 10%iles   -0.0641041   -0.0247175  -0.00953585 -0.000899170
      0.00000   0.00552750    0.0153706    0.0314263    0.0703109
stardiff contour -excluded 0.005   -0.0641041    0.0703109