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A typical .x run will require an amount of temporary disk space in the
order of O double precision complex numbers:
O = NkMN + qNr1Nr2Nr3
where
q = 2 x
mixing_ndim (number of iterations used in
self-consistency, default value = 8) if disk_io is set to 'high'; q = 0
otherwise.
Paolo Giannozzi
2010-06-24