mply saves the data and returns without further processing.
      It may be specified using either the <code class="literal">:DATA</code> or <code class="literal">:FOMUS</code> keywords in the 
      <code class="varname"><a class="link" href="ch05s04.html#setting.output">OUTPUT</a></code> setting.
      The file is editable and can be reloaded for editing and processing by calling the <code class="function"><a class="link" href="ch03s04.html#function.fomus2">FOMUS</a></code>
      function with the name of