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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