Notes. λ₀ is the central wavelength for the electronic transition associated with the spectral line; n_λ is the number of observed wavelengths for each spectral line; Δλ is the spectral sampling in mÅ; e_low and e_upp are the electronic configurations of the lower and upper energy level, respectively; E_low is the excitation potential (in eV) of the lower energy level. These atomic data are adopted from NIST (Kramida et al. 2023). In particular, Nave et al. (1994) is used for Fe and Edlén & Risberg (1956) for Ca. The α and $\sigma /a_0^2$ are the velocity exponent and collision cross-section parameters (in units of Bohr’s radius, a₀), respectively, as defined in the Anstee, Barklem, and O’Mara collision theory for the broadening of metallic lines by neutral hydrogen collisions (Anstee & O’Mara 1995; Barklem & O’Mara 1997; Barklem et al. 1998).