In big hurry, so I'll be terse. There are (of course :) three:

1. Trixcel:
http://www-sst.unil.ch/perso_pages/j...el/Trixcel.htm

(or Google for links to it and comments; it's in French but should be
self-explanatory; I remember there was also an English version XTXC, can't
remember whether older or newer than Trixcel)

OK, JUST FOUND IT: for link to XTXC go to
http://www.agri.upm.edu.my/~chris/tal/talxl.html

2. Ternplot: has an article "TernPlot: an Excel spreadsheet" in Computers
and Geosciences; find the file itself by means of Google yourself

3. tri-plot: http://www.lboro.ac.uk/research/phys-geog/tri-plot/

Best regards,

Gaj Vidmar
Uiv. of Ljubljana, Fac. of Medicine, Inst. of Biomedical Informatics

"Frank Martin" wrote in message
...
I have Excel2003 and I need some way to form triangular/ternary charts.

Is there any way, or is there some plug-in available?

Please help, Frank