XMM-Newton/MOS2 (blue) and ROSAT/PSPC (red) surface-brightness profile of the cluster A3571, fitted jointly with a double-beta model. The individual normalizations and background levels were fitted independently. The higher XMM-Newton data points and model at large radii are caused by a higher background. The bottom panel shows the deviations (in σ) from the surface-brightness model.
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