Brent, thanks for the additional information; I'll keep it on my computer and perhaps someday in the future it may prove helpful. One never knows when trips to places like this may be planned. I've had to delete MOST of your message because of the "overquote" limit of 30 lines. Thanks, aj -- This message is from the AZ-Observing mailing list. See this message's header if you want info about unsubscribing or the list's archive. This is a discussion list. Please send personal inquiries directly to the message author. In other words, do not use "reply" for personal messages. Thanks.