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How do I plot contours from measurements taken on a rectangular 2D lattice ?


Hello, I am new to this newsgroup.
I will shortly have an array of 40 x 41 = 1640 height measurements on 
some undulating land, taken at 1 metre intervals on a square grid. Each 
measurement has an error of about 5%.
How do I display the data as smooth interpolated height contours ?
-- 
Daniel Marks


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