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This file contains the partial charge densities. By specifying LPARD=.TRUE. and some other control tags, such as e.g. EINT, in the INCAR the partial charge densities are written out to the PARCHG file. If only LPARD=.TRUE. is set without any other criteria for charge separation the charge density is written for the whole unit cell to the CHGCAR file. For details about partial charge please see Band decomposed charge densities.