Left: Planck Comptonisation y map of the Tier-1 cluster PSZ2 G077.90−26.63. The black circle represents R500. Right: radial SZE profile in Comptonisation parameter, y, and radial units of R500. The profile is derived from the y-map following the method published in Planck Collaboration Int. V (2013). The individual points are correlated at about the 20% level and the error bars show the square root of the diagonal elements from the covariance matrix. The blue shaded envelope shows the dispersion in flux about the profile.
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