I'll ask Mike Keller to answer this, so only one answer appears on this list. (Now, Mike, if you don't know, please defer privately to someone else on the list to answer in your stead.) Is there someplace on the Internet where thigns like N/T2*Q and hot periods are defined? I'd just like to understand what I'm looking at. Thanks, Lucille Reilly -------------- next part -------------- An HTML attachment was scrubbed... URL: </geyser-list/attachments/20050117/087e929f/attachment.html>