Worldwide astronomical and astrophysical research
Surface density of X-ray point sources in galaxy clusters divided by the optical galaxy profile as a function of radius. Error bars indicate the 1σ confidence limits for small numbers of events in astrophysical data. Except for the bottom panel, a significant X-ray point source excess is found between 2 
and 2.5 
at the 99.9% confidence level (99% for SPT-CL0546-5345).
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