Three C II emission lines detected in the X-shooter spectrum +4.3 days after peak. A local linear continuum subtraction and a normalization to the peak flux has been applied for illustration purposes. The spectra have been smoothed using a Savitzky-Golay filter while the original data are shown in a lighter color. The rest-frame wavelength of the C II emission is denoted by the dashed vertical line. Note that the narrow emission component at 6580 Å is the Hα emission from the host galaxy.