A flag indicating what information will be printed to the screen (or A.log file)
when an atom in the X-window is clicked.

<p>
1: print scaled coordinates of the atom <br>
2: print real coordinates of the atom <br>
3: print <tt>color_ind</tt>, which can mean <tt>EPOT_IND</tt> (default) or <tt>TOPOL</tt> depending on
   <tt>plot_color_axis</tt>. <br>
4: print force acting on the atom <br>

<p>
Example: <tt>MD++/scripts/CSD-book/chap3/sect3.3/al-fr-eng.script</tt>
<p>
Also see <tt>plot_color_windows</tt>, <tt>plot_color_axis</tt>.
