This directory shows the calculation of the phonon frequencies at Gamma 
of a simple cubic Si cell with 8 atoms. The BZ sampling is made with 
the gamma point only.

dfpt_8.in

These frequencies should coincide with those calculated at gamma and X
with a fcc cell with two Si atoms, if the BZ sampling is made with the
points:

(0.0, 0.0, 0.0) weight = 1.0
(1.0, 0.0, 0.0) weight = 1.0
(0.0, 1.0, 0.0) weight = 1.0
(0.0, 0.0, 1.0) weight = 1.0

dfpt.g.in
dfpt.x.in

calculate these frequencies.
