VPFIT models (red line) for the (top) Na I D, (middle) K I, and (bottom) DIB at 5780 Å absorption features present in the Magellan Clay (+MIKE) medium-resolution spectrum (black line) of AT 2014ej discussed in detail in Appendix B. According to Phillips et al. (2013, see their Fig. 3), the column density for Na I D is at the saturation limit and therefore does not provide a reliable estimate for reddening. The K I lines do provide an extinction estimate, but come with a high uncertainty. Finally, according to Phillips et al. (2013, see their Eq. (6)), the EW of the DIB feature at 5780 Å estimated with fitprofs task in IRAF gives the visual extinction mag. This value is fully consistent with the extinction value estimated using the Balmer decrement combined with line measurements made from the MUSE spectrum (see Fig. A.1) at the location of AT 2014ej.