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A typical pw.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.
Layla Martin-Samos Colomer
2012-11-21