Detailed spectrum of Obs. 11044, overplotted with the positions of line features identified in Miškovičová et al. (2016) (black) and transitions from the selection described in Sect. 3.4 (grey). Spikes with a significance σ > 2σ are highlighted in orange. For subsequent iron transitions belonging to the same ion the label is shown only once. A list of spikes and associated transitions can be found in Tab. C.1. In contrast to Obs. 3814, the lines indentified by Miškovičová et al. (2016) are P-Cygni profiles, which makes the absence of spike features plausible (see Sect. 5.4).