Bottom panel: montage of the Hα profile evolution during the first 7 epochs of observations. Time goes from bottom to top, and the first 5 spectra were taken with the 2.2 m+FEROS. Top panel: montage of the Hα profile evolution during the last 6 epochs which were taken with the VLT+X-Shooter. Note that epochs 6 and 7 appear in both panels. The sequence has been presented in two separate panels for clarity: the intensity of the broad component decreased by a factor  ~65 from epoch 2 (at maximum light) to epoch 7 (see Fig. 3). The dotted vertical line marks the Hα rest wavelength. The numbers near each spectrum mark the epoch of the spectrum itself in days after maximum.