<tt>plot_color_bar = [ <i>enable  fmin  fmax</i> ] </tt>

<p>
If <tt><i>enable</i> == 1</tt>, then the atoms will be colored using a continuous
color bar according to their <tt>color_ind[i]</tt> values.  When  <tt>color_ind[i]</tt>
reaches <tt><i>fmin</i></tt> or <tt><i>fmax</i></tt>, the color on the end of the
color bar is used.

<p>
<tt>color_ind</tt> is either <tt>EPOT_IND</tt> or <tt>TOPOL</tt> depending on the value of
<tt>plot_color_axis</tt>.
