feature that cannot be accessed
directly from <code>plot2d</code> in Maxima. Other examples of input
files for openmath are the files <tt>`maxout.openmath'</tt> that Maxima
creates; when Maxima is run from the command line, and a plotting
function that involves openmath is used, the data is not passed directly
to Xmaxima, but it is rather saved into that file and then xmaxima is
executed with the name of that file as argument.
</p>
<p>The strings used in those files must be properly represented as Tcl/Tk
st