Examples of Planck galaxy clusters. Left: DSS red image of PSZ1 G101.52-29.96 at z = 0.227. Centre: SDSS i′-band image of PSZ1 G054.94-33.37 at z = 0.392. Right: deeper RTT150 i′-band image of PSZ1 G108.26+48.66 at z = 0.674. The images are approximately 1.5 Mpc on a side at the redshift of the cluster.
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