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The path to the VPS and PAO directories can be specified in your input file
by the following keyword:
DATA.PATH ../DFT_DATA11 # default=../DFT_DATA11
Both the absolute and relative specifications are available.
PAO files in a database should not be used for the VPS in other databases,
since semicore states included in several elements are different from each other.
So, the consistency in the version of PAO and VPS must be kept.
For that reason, it would be better to store PAO and VPS files of
each version in different directories. In this case, the keyword is useful.