
<tt>x</tt> <i>f<sub><img src=lambda10.gif></sub></i>(<i>q</i>)
</ul> 
where <i>q</i> designates the internal coordinates.  Often these are angles, in which case
the functions <i>f<sub><img src=lambda10.gif></sub></i> are spherical harmonics, rotation matrix elements,
or products of these. The particular choice of functions depends on which kind of system you
are describing, and is controlled, within the Hibridon<font size=-2><sup>TM</sup></font> package, by the <a href=basis.html>
<tt>BASIS</tt></a> subrou