**Table 2:** Quality of the fits evaluated by typical equivalent signal-to-noise ratio $\langle eqS/N \rangle$ and typical value of $\langle \chi^2 \rangle$ computed as time averages along the slit.
line [Å]		$\langle eqS/N \rangle$	$\langle~\chi^2 \rangle$
Fe I	4992.8	113.4	9.8 $\times$ 10^-5
Fe II	4993.3	85.7	17.4 $\times$ 10^-5
Fe I	4994.1	68.9	28.2 $\times$ 10^-5
Ca I	6455.6	135.1	8.8 $\times$ 10^-5
Fe II	6456.4	114.3	11.0 $\times$ 10^-5

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