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Line 206: \| volume=645 \| at=id. A67 \| date=January 2021 \| doi=10.1051/0004-6361/202039337 \| arxiv=2010.13430 \| bibcode=2021A&A...645A..67M }}</ref> [[File: Open cluster HR diagram ages.gif\|right\|thumb\|upright=1.2\|[[Hertzsprung–Russell diagram\|H–R diagram]] for two open clusters: [[NGC 188]] (blue) is older and shows a lower turn off from the main sequence than [[Messier 67\|M67]] (yellow). The dots outside the two sequences are mostly foreground and background stars with no relation to the clusters.]]

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