.LP
3D data points may be directly typed into an ascii file using an editor, or
a program may generate them.   Either C-style /*  */ comments
or a '#' may be used to designate comments in the functions file. If
a '#' is used, then all characters to the end of that line are ignored.
Data points may be in float or integer values,
but the file should be in the following form:
.IP
x y z { XYZ triplets }
.br
x y z
.br
x y z
.LP
Actually, the (x,y,z) triplets need not each appear on a line as above; the 
triples may occur as:
.IP
x
.br
y
.br
z
.br
x
.br
y
.br
z
.LP
or even as:
.IP
x y z x
.br
y
.br
z 
.br
x y z x y z
.br
etc.  
.LP
Or only (z) data may be present. In this case the (xy) data will be generated
staring at zero
.IP
z
.br
z
.br
etc.
.LP
Depending on whether XYZ data or Z only data is specifed in the input file,
the "Data Format" option must be set accordingly. The "Data Format" optiion
is specified by toggling beteen XYZ triplets and Z only. Use the mouse to
select the appropriate format.
.LP
To plot the data points, fill out the "Filename" parameter with the name of 
the desired ascii file, and click on the "PLOT FILE" action button.  
The ascii data points will be read in and displayed according to the current
value of the "plot type" toggle. 
.LP
The number of points to be displayed in the workspace may be controlled by
changing the "step size", "begin" and "end" data points.  Note that this
does not change the data in the file, but only how the data is displayed
in the workspace. 
