We study the instrumental features of photons from the peak observed at E _ { \gamma } = 130 GeV in the spectrum of Fermi-LAT data .
We use the sPlots algorithm to reconstruct – seperately for the photons in the peak and for background photons – the distributions of incident angles , the recorded time , features of the spacecraft position , the zenith angles , the conversion type and details of the energy and direction reconstruction .
The presence of a striking feature or cluster in such a variable would suggest an instrumental cause for the peak .
In the publically available data , we find several suggestive features which may inform further studies by instrumental experts , though the size of the signal sample is too small to draw statistically significant conclusions .