fter abs(ITER) iterations.

<BR>
Iterations are normally also stopped if the successive differences are smaller
than the errors estimated for the numerical integration of the coupled
equations. Setting IPS <SPAN CLASS="MATH"><IMG
 STYLE=""
 SRC="img18.svg"
 ALT="$&lt; 0$"></SPAN> uses abs(IPS), without this extra check.

<P>
5ex1
IBLOCK is the number of pairs of excitation levels
(starting from partition 1, excitation 1) that are coupled exactly by
blocking together.
<BR>
If IBLOCK<SPAN CLASS="MATH"><IMG
 S