subtract 10%iles      0.00000   0.00130272    0.0210619    0.0433154
    0.0702484     0.106156     0.159678     0.254004     0.494936
diff 10%iles    -0.189440   -0.0732727   -0.0310432  -0.00714779      0.00000
   0.00661159    0.0305452    0.0726385     0.188028
stardiff 10%iles   -0.0274966  -0.00905909  -0.00231362      0.00000
   0.00111353   0.00518948    0.0101796    0.0179948    0.0371733
stardiff contour -excluded 0.005   -0.0274966    0.0371733