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We present results of a gravitational lensing and optical study of MACS J1423.8+2404 (z= 0.545, MACS J1423), the most relaxed cluster in the high‐redshift subsample of clusters discovered in the MAssive Cluster Survey (MACS). Our analysis uses high‐resolution images taken with the Hubble Space Telescope in the F555W and F814W passbands, ground‐based imaging in eight optical and near‐infrared filters...
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