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
  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 was
claimed 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 continuum
is well-modeled as a power law up to 8 keV, and parameters of the background
model are well constrained over this larger interval of energies. This allows
for a detection of the line at 3.53 keV with a statistical significance greater
than ~3 sigma and for the identification of several known atomic lines in the
energy range 3-4 keV. Limiting the analysis to the 3-4 keV interval results in
increased uncertainty, thus decreasing the significance of the detection. We
also argue that, with the M31 data included, a consistent interpretation of the
3.53 keV line as an atomic line of K XVIII in all studied objects is
problematic.
