inated by an empty <B>&amp;step</B> namelist, or by IB<SPAN CLASS="MATH"><IMG
 STYLE=""
 SRC="img14.svg"
 ALT="$&lt;$"></SPAN>0 indicating the last entry.
<BR>
<P>
For each k used here, P(k) must have been non-zero,
and the required coupling has the same form factor but with relative strength
STR / P(k).   That is, STR is the reduced matrix element <!-- MATH
 $<IB | M(Ek) | IA>$
 -->
<SPAN CLASS="MATH"><IMG
 STYLE=""
 SRC="img132.svg"
 ALT="$&lt;IB \vert M(Ek) \vert IA&gt;$"></SPAN>
= M(Ek, IA<SPAN CLASS="M