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Convert lists to data frames for use by lattice.
con2tr(obj)
A data frame suitable for passing to lattice (formerly trellis) functions.
A list of components x, y and z as passed to contour.
x
y
z
contour
con2tr repeats the x and y components suitably to match the vector z.
con2tr
Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.