Table 1: Atomic constants for the Ru I and Hf II lines used in this work, and references for $\log gf$ . "Sun'' denotes the gf-values fitted on the solar and Arcturus spectra. Other gf-values were taken from VALD, Lundqvist et al. (2006) (L06), and Lawler et al. (2007) (L07).
El. $\lambda$ (Å) $\chi_{\rm ex} \rm (eV)$ $\log gf$ $\log gf$ $\log gf$ $\log gf$

VALD Sun L06 L07

Hf II 4080.437 0.608 ... -0.896 -1.596 -1.55

Hf II 4093.155 0.452 -1.090 ... ... -1.15

Ru I 4080.574 0.810 -0.040 ... ... ...

Ru I 4757.856 0.928 -0.890 -0.540 ... ...

**Table 1:** Atomic constants for the Ru I and Hf II lines used in this work, and references for $\log gf$ . "Sun'' denotes the gf-values fitted on the solar and Arcturus spectra. Other gf-values were taken from VALD, Lundqvist et al. (2006) (L06), and Lawler et al. (2007) (L07).
El.	$\lambda$ (Å)	$\chi_{\rm ex} \rm (eV)$	$\log gf$	$\log gf$	$\log gf$	$\log gf$
			VALD	Sun	L06	L07
Hf II	4080.437	0.608	...	-0.896	-1.596	-1.55
Hf II	4093.155	0.452	-1.090	...	...	-1.15
Ru I	4080.574	0.810	-0.040	...	...	...
Ru I	4757.856	0.928	-0.890	-0.540	...	...

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