[R-sig-Geo] Kernel density plot on a US map

[vioravis]

After a few trials it appears that the cause of the errors is the points
lying outside the specified window.

1. As a quick fix, I could remove the points (only a few) and do the
analysis. How do I check whether a point lies within the window or not???

2. I have a few points in Alaska and Hawaii that do not appear in the map.
How do I add those regions to the US map???

Please let me know. Thank you.

Ravi

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