Dear Jessica,

I suppose that other softwares can do that, but SigmaPlot, which is the
one I use, allows constructing 3-D scatterplots (also contour, mesh and
line plots), that might be useful for your work. You can also fit the data
to a few 3-D curves (plane, paraboloid, gaussian, lorentzian), or create
your own 3-D model.
If you want to compare a few points, without looking at the general trends
among variables (e.g. to compare qualitatively samples from a few
locations), a ternary plot (triangular, also available in Sigmaplot) may
be enough.

best wishes, and good look with the figures!!

Pitter Ferrio

Departament de Producció Vegetal i Ciència Forestal
Universitat de Lleida
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> Hello All,
>
> I would like to plot 3 isotope ratios (dD, d18O, and d13C) on a single
> graph and examine correlations. Would anyone have suggestions for
> setting up such a graph (maybe triangular?) and analysis? Has anyone had
> success doing this with a particular software? Or is there a better way
> to present the data and examine relationships?
>
> Many thanks,
>
> Jessica
>
> Jessica C. North
> Resource Consultant - PhD Candidate
>
> Department of Chemistry
> University of Otago
> PO Box 56, Dunedin
> New Zealand
> Tel 64 3 479 7915 (please note new office number)
> Mob 021 044 0382
> Fax 64 3 479 7906
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> [log in to unmask]
>