Comment on "Dark matter searches going bananas: the contribution of   Potassium (and Chlorine) to the 3.5 keV line"
  The recent paper by Jeltema & Profumo(2014) claims that contributions from \ion{K}{18} and \ion{Cl}{17} lines can explain the unidentified emission line found by Bulbul et al 2014 and also by Boyarsky et al, 2014a, 2014b. We show that their analysis relies upon incorrect atomic data and inconsistent spectroscopic modeling. We address these points and summarize in the appendix the correct values for the relevant atomic data from AtomDB. 
Esra Bulbul, Maxim Markevitch, Adam R. Foster, Randall K. Smith,   Michael Loewenstein, Scott W. Randall
astro-ph.HE astro-ph.CO hep-ph