Fix all atoms whose position falls within a specified domain and whose <tt>TOPOL[i]</tt> value
falls within a range.

<p>
Usage: <tt>input = [ <i>enable  sx_min sx_max sy_min sy_max sz_min sz_max t_min t_max</i> ]</tt>
<br>
If <tt><i>enable</i></tt> = 1, then all atoms <tt>i</tt> whose scaled coordinates fall
within a rectangular region, i.e. 
<tt>sx_min <= SR[i].x < sx_max</tt>, 
<tt>sy_min <= SR[i].y < sy_max</tt>, 
<tt>sz_min <= SR[i].z < sz_max</tt>, and whose central symmetry parameter falls within a range
<tt>t_min  <= TOPOL[i] < t_max</tt>, will be fixed (i.e. <tt>fixed[i] = 1</tt>).

<p>
Also see <tt>fixatoms_by_position</tt>.
