subtract 10%iles      0.00000  0.000244141    0.0290942    0.0633907
     0.104170     0.159884     0.244740     0.393101     0.745130
diff 10%iles    -0.264018    -0.104104   -0.0439460   -0.0106362      0.00000
   0.00837612    0.0421431     0.103360     0.264666
stardiff 10%iles   -0.0385880   -0.0132417  -0.00407731      0.00000
  0.000473112   0.00563429    0.0122609    0.0231101    0.0499207
stardiff contour -excluded 0.005   -0.0385880    0.0499206