Write the real coordinates of atoms into a file whose name is specified by <tt>finalcnfile</tt>.
Each line of the file has the format of:
<p>
<tt><i>i</i> R[<i>i</i>].x R[<i>i</i>].y R[<i>i</i>].z fixed[<i>i</i>]</tt>

<p>
If <tt>input = 1</tt> is set before calling this command, only atoms whose <tt>fixed[<i>i</i>]</tt>
value is nonzero are written.
