why doesn't the 2D contours graph with Nonpar Density include outliers?

[#1]

why doesn't the 2D contours graph with Nonpar Density include outliers? how to include outliers in Nonpar Density 2D contours as in HDR 2D contours?

the picture on the left/top in Nonpar Density , the picture on the right/bottom is HDR on the same variables.

  

[#2 · Accepted solution]

They are different methods/perspectives by definitions. HDR only has two levels of rings for 50% and 99% to emphasize. One can certainly draw nonparametric density contour with 100 levels and spot the outer 1% in the last ring. Nonparametric density contour provides better sense about how the denseness gradually change from area to area, but does not emphasize what HDR does.