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For charge densities and potentials, half the storage can be saved
if one of these flags is used, since
To use a real to complex FFT you must specify -DNGXhalf for the
serial version and -DNGZhalf for the parallel version.
If -DNGXhalf is specified for the serial version
the real to complex FFT is "simulated" by a complex to complex FFT.
Mind: If this flag is changed in the makefile, recompile all
*.F files. This can be done typing
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