On Wed, 20 Oct 2004 21:03:31 +0200 (MEST), Tobias Oetiker
<[EMAIL PROTECTED]> wrote:

> you could use CDEF to establish a value which is constantly -20
> draw this as AREA and then use STACK for the actual temperature ...

Thanks, Tobi!  It ended up taking a slightly different CDEF but I
think I now have what I'm looking for.  Have a look:

http://chrissnell.com:48000/graphs/?graph_type=temperaturec&start=8000

Chris

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