If several plots are to be plotted, subsequent data plots (or functions) can be
specified, separated by commas. The optional sections are shown with braces.
Note that only one set of ranges can be specified, as the subsequent plots (or
data plots) use the same range. Data plots can either have just the z coordinate
specified, in which case the X and Y coordinates are determined by the position
in the file, or X, Y, and Z coordinates may be specified. In the case where all
three coordinates are specified, you must use the set parametric
command to set gnuplot to use the plot parameters. For both cases, a blank line
is used to separate different sets of data. A sample file was plotted using the
following command:
