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Recommended minimum setup

Although the previous calculations can be performed using an empty INCAR
file it is recommended to specify a few parameter always manually

PREC = Normal # precision normal
ENCUT = 300 # cutoff used throughout all calculations
LREAL = .FALSE. or Auto # real space projection yes / no
ISMEAR = 0 or 1 or -5 # method to determine partial occupancies

These four parameters should be present in all calculations. They
completely control the technical accuracy of the calculations in particular
the basis sets (`ENCUT`), and wether
the real space projection scheme is used or not. Total energies of two calculations
should be only compared and subtracted, if the first three parameters
are set identically in both calculations. Ideally the parameter `ISMEAR `
should be also identical throughout all calculations (but this might be
difficult in some cases).

N.B. Requests for support are to be addressed to: vasp.materialphysik@univie.ac.at