Table 4: Linear relation between $f_{{\rm grad}}$ and the logarithm of the period: $f_{{\rm grad}} = S \log P + ZP$ for the Fe I 4896.439 Å spectral line.
S ZP $\chi_{{\rm red}}^2$

O $-0.003 \pm$ 0.005 0.997 $\pm$ 0.006 2

O + C $-0.003 \pm$ 0.004 0.996 $\pm$ 0.005 3

**Table 4:** Linear relation between $f_{{\rm grad}}$ and the logarithm of the period: $f_{{\rm grad}} = S \log P + ZP$ for the Fe I 4896.439 Å spectral line.
	S	ZP	$\chi_{{\rm red}}^2$
O	$-0.003 \pm$ 0.005	0.997 $\pm$ 0.006	2
O + C	$-0.003 \pm$ 0.004	0.996 $\pm$ 0.005	3

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