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Verify the q-point for which you are calculating phonons. In order to
check whether a symmetry operation belongs to the small group of q,
the code compares q and the rotated q, with an acceptance tolerance of
10-5
(set in routine PW/eqvect.f90). You may run into trouble if
your q-point differs from a high-symmetry point by an amount in that
order of magnitude.
Paolo Giannozzi
2009-10-01