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plotting data in a triangular domain

Dear Mathgroup,

Hallo. I am a beginner in the use of Mathematica and I would appreciate the help
of some experts. 

I have to plot the graph of a function defined on a triangular domain. I don't
have the formula of the function, but I can generate a text file containing a
sampling of the function. I would like to view its surface with "mesh lines".

Is it possible to do it by Mathematica? Is so, how can I do it? 


With best regards,


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