I'm curious about your need for "parametric" graphs? The densitometery I've
seen makes use of logarithmic scales. At any rate, you may want to take a look
at Gnuplot. This is freely available on the net from several
places. Sorry I don't have an address handy, but a web search should locate it
or can find it if you are interested. It will do both logarithmic and 3-D
parametric plots. There are also quite a few technical graphing packages
commercially available as well.
- Wayde Allen
(74160.3410@compuserve.com)