Left: evolution of the Na Iλλ5890,5986 line (dashed gray lines), possibly blended with He Iλ5876. The approximate evolution of the absorption minimum from a Gaussian fit after −19 d is marked with a solid gray line. The velocity evolution is slow during the second peak and the subsequent decline. Middle: evolution of the putative [O I] λλ6300,6364 (dashed red lines) and [N II] λλ6548,6584 (dashed gray lines) doublets after the second peak. Both start to appear between +41 and +71 d and strengthen over time. Right: evolution of the [Ca II] λλ7291,7323 (dashed gray lines) + [O II] λλ7320,7330 (dashed red lines) feature. Zero velocity refers to the stronger line of each doublet. All forbidden features shown here are double-peaked at late times.