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hexagonal lattices

We strongly recommend to use only Gamma centered grids for hexagonal lattices. Many tests we have performed indicate that the energy converges significantly faster with $ \Gamma $ centered grids than with standard Monkhorst Pack grids. Grids generated with the ``M'' setting in the third line, in fact do not have full hexagonal symmerty.

N.B. Requests for support are to be addressed to: