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ListPlot3D type plotting


I have an array of data z=f(x,y) I would like to plot as a surface much
like ListPlot3D does. However, ListPlot3D requires a square and regularly
spaced array of x,y values. In fact in doesn't even ask for them at
all, but assumes the square, regular distribution. Is there a way to 
get a similar looking plot for a rectangular grid which may not be evenly
spaced, given values of x,y, and z. I really need the surface appearance, so 
ContourPlot, is out, and ParametericPlot3D requires functions, which I 
don't have, and I have way too many points to make an interpolating
function. 
Thanks for any ideas.
------
Mark Stabb
University of Wisconsin-Madison
Department of Engineering Mechanics and Astronautics
stabb at cmgroup.engr.wisc.edu





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