Firstly, the point group of your system is generated as explained
in Section 2.6.11.4. When the point group
is built, you will be asked about the number of ``divisions''.
The larger this number is, the larger is the number of tetrahedra
generated and thus the larger is the number of nonequivalent -points.
All this vital information is shown on the screen as you play with
the generator trying different number of divisions. It is worth mentioning
that sometimes with the larger number of divisions (and the larger
number of tetrahedra) you can get the same or only slightly
larger number of
-points. Of course, the larger number
of tetrahedra, the better.
Once the -points are generated, a file brill.dat
is written which contains an important information for the DOS calculation
to be done by the lev00 routine, see Section 3.6.2.