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We revisit the X-ray spectrum of the central 14' of the Andromeda galaxy,discussed in our previous work [1402.4119]. Recently in [1408.1699] it wasclaimed that if one limits the analysis of the data to the interval 3-4 keV,the significance of the detection of the line at 3.53 keV drops below 2 sigma.In this note we show that such a restriction is not justified, as the continuumis well-modeled as a power law up to 8 keV, and parameters of the backgroundmodel are well constrained over this larger interval of energies. This allowsfor a detection of the line at 3.53 keV with a statistical significance greaterthan ~3 sigma and for the identification of several known atomic lines in theenergy range 3-4 keV. Limiting the analysis to the 3-4 keV interval results inincreased uncertainty, thus decreasing the significance of the detection. Wealso argue that, with the M31 data included, a consistent interpretation of the3.53 keV line as an atomic line of K XVIII in all studied objects isproblematic.

Comment on the paper "Dark matter searches going bananas: the  contribution of Potassium (and Chlorine) to the 3.5 keV line" by T. Jeltema  and S. Profumo