_i\cdot \nabla_j$">.
</LI>
</OL>
The mean radius gives an indication of the size of the atomic system,
whereas the dipole-dipole operator (denoted as <TT>r.r</TT> in the <TT>summry</TT> file) is relevant to long-range interactions&nbsp;[#!babb!#].

<P>
</LI>
<LI><TT>LSn.l</TT>:
<TT>mchf</TT> saves the eigenvectors for each term included
in the configuration list in a separate file. Multiple eigenvalues
and eigenvectors for a given term are saved in the same file, Therefore,
an <TT>LSn.l</TT> file contains a