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Dear All, I may not have been clear about what I was looking for. I had two questions: (1) scientific validity of two components that if they are individually scientifically viable, can they be divided one by the other and then this figure plotted against a third component, z (which is actually 1D space, ie. z = location of x/y along the mineral grain). Prof. Clemens: I know about spurious correlation from Rollinson, but I had in mind an isochron plot for (ii) – (x = f/g -v- y = h/g), which I understand holds unlike oxide plots. If this is now considered not to be the case, please advise. Specifically, can (1) above hold scientifically? (2) Plot 2D in Excel – again I was thinking along the lines of (1) above but for 2D = crystal face. Thank you for suggestions of alternative programmes to do this. I thank all for suggestions of tetrahedra plots – they were not what I was looking for today (my fault, apologies), but I know I will in the future – I have kept the details. Frank Spear and Paul Jackson: I will write to you separately. Thank you all for your responses. Regards, Joanie _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.