def read_nmr_efg(self):
        """
        Parse the NMR Electric Field Gradient interpretted values.

        Returns:
            Electric Field Gradient tensors as a list of dict in the order of atoms from OUTCAR.
            Each dict key/value pair corresponds to a component of the tensors.
        """
        header_pattern = r'^\s+NMR quadrupolar parameters\s+$\n' \
                         r'^\s+Cq : quadrupolar parameter\s+Cq=e[*]Q[*]V_zz/h$\n' \
                         r'^\s+eta: asymmetry parameters\s+\(V_yy - V_xx\)/ V_zz$\n' \
                         r'^\s+Q  : nuclear electric quadrupole moment in mb \(millibarn\)$\n' \
                         r'^-{50,}$\n' \
                         r'^\s+ion\s+Cq\(MHz\)\s+eta\s+Q \(mb\)\s+$\n' \
                         r'^-{50,}\s*$\n'
        row_pattern = r'\d+\s+(?P<cq>[-]?\d+\.\d+)\s+(?P<eta>[-]?\d+\.\d+)\s+' \
                      r'(?P<nuclear_quadrupole_moment>[-]?\d+\.\d+)'
        footer_pattern = r'-{50,}\s*$'
        self.read_table_pattern(header_pattern, row_pattern, footer_pattern, postprocess=float,
                                last_one_only=True, attribute_name="efg")
Parse the NMR Electric Field Gradient interpretted values.

        Returns:
            Electric Field Gradient tensors as a list of dict in the order of atoms from OUTCAR.
            Each dict key/value pair corresponds to a component of the tensors.