A vector array containing the real coordinates of atoms (in &Aring;).

<p>
The real coordinates  <b>r</b><sub>k</sub> and scaled coordinats <b>s</b><sub>k</sub>
of atom k is related to each other by
 <b>r</b><sub>k</sub> = <b>H</b> &sdot; <b>s</b><sub>k</sub>.

<p>
Also see <tt>SR</tt>, <tt>H</tt>, <tt>SHtoR</tt>, <tt>RHtoS</tt>, 
<tt>changeH_keepS</tt>, <tt>changeH_keepR</tt>.


