PSZ1 G109.14-28.02 RTT150 i′-band image, dashed circle (2′ radius) shows the location of Planck SZ source. In addition to the rich cluster at z = 0.457 (solid circle), there are also two galaxy groups at z = 0.234, a nearby elliptical galaxy at z = 0.0418, and a bright star in the field.
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