Hi...it is probably trivial, but I do not know how to do the following:
I want the output of a xy plot to be plotted in different colors according to a given condition ...
I want to plot temperature dependency of flow stress ; for some (rare) occurencies I've got a special condition (chemical composition change) , and I want these points to appear on the same graph...I do know how to change the appearance of all the plots with the par() command or the points()...

Thanks 
Anne
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