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Figure 2
Figure 2: Colour–magnitude diagram for M80. Image reproduced from the catalogue of 52 globular clusters (see [413]). The entire catalogue is available at the Padova Globular Cluster Group website [166].

Matthew J. Benacquista and Jonathan M. B. Downing, "Relativistic Binaries in Globular Clusters",
Living Rev. Relativity, 16 (2013), 4, doi:10.12942/lrr-2013-4, URL (accessed <date>): http://www.livingreviews.org/lrr-2013-4.
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