[R] contouring x y scatter data

[emorway]

Hi Carlos, 

Thanks for the response.  The plot you suggested was not in line with what
I'm trying to produce in R.  The last plot found at:  

http://www.advsofteng.com/gallery_contour.html  

is more along the lines of what I'm looking for.  Notice the scatter points
(shown by "x") are not laid out in a regular/gridded fashion, yet the
plotting software was still able to use some kind of interpolation and plot
contours.  All the contouring options I'm finding in R require the spatial
locations of data points to be in a 'regular' grid.  That is, data in each
row must have the same y coordinate and data in each column must have the
same x coordinate.  I'm seeking flexibility in the location of the points on
which the contours are based.

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