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/usr/share/gnuplot/pm3d/README is in gnuplot-x11 4.6.4-2.

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colorpts.awk
	script for drawing colour points (colour according to the point
	z-coordinate). Try colorpts-demo.gp

pm3dCompress.awk
	script to shorten postscript files created by the pm3d splot from
	regular	(grided) data (maps)

pm3dConvertToImage.awk
	script to shorten postscript files with pm3d splot and matrix-like
	input data. See the header of the script for more details.