pssave:

Synopsis: Save the plot as data-file.

Syntax: pssave ( "file_name", X, Y, Z )

Description:

	The pssave() saves the usual temporary file to a specific, 
	non-temporary file named "file_name". pssave() is for 3D-plots. 
	This is useful if you wish to save session-output in a 
	GNUPLOT-way.

