Some of the Ca I, Ca II, Na I, and O I lines seen in emission during the quiescence phases (pre- and post-outburst). The zero velocity is marked by a dotted line (in the cases of the Na I D and O I triplet, we mark the zero velocity for each resolved line). The dashed lines in the Ca II K and Ca II 8662 Å lines mark the position of the Balmer Hϵ and Paschen 13 lines, respectively. The weaker line redwards of Ca I 4226 is Fe I 4227. Different colors mark different dates as in Fig. 1.