subtract 10%iles  -0.00197124    0.0128384    0.0273552    0.0442758
    0.0653133    0.0930536     0.132549     0.196555     0.334883
diff 10%iles    -0.163141   -0.0791759   -0.0413704   -0.0177813  0.000510216
    0.0187531    0.0422468    0.0797887     0.163104
stardiff 10%iles   -0.0394584   -0.0191817  -0.00945291  -0.00250145
   0.00349142   0.00939104    0.0160818    0.0253436    0.0438491
stardiff contour -excluded 0.005   -0.0394584    0.0438491