Zoomed-in view of the Na I D spectral region in the Echelle spectra. The Na I D doublets of the MW (red solid line) and that of the LRN (blue solid line) are plotted in the velocity space relative to the λ5890 line (Na I D2). Top: −3.4 d spectrum. The feature observed at λ5890.9, indicated as third component (green dashed line), is also shown at zero velocity. Adopting a tentative classification as an additional Na I D2 component redshifted by ∼50 km s⁻¹ (e.g., from a gas cloud along the line of sight), we note however that the corresponding Na I D1 line is missing in this early spectrum. Bottom: +33.6 d spectrum. While the λ5890.9 feature is still visible, a new line appears at λ5896.9 at the expected wavelength of Na I D1, that we preferentially identify as an Fe I or a V II transition (see text).