Fig. 5.
Half-light radii (Rh) versus absolute magnitudes (MV) for GC1 in M 81 (filled red circle with error bar) in comparison with Galactic GCs from the online database of Harris (1996; 2010 update) GCs (cross). The filled cyan circles are the extended star clusters (half-light radii greater than 5 pc) in NGC 4278, 4649, and 4697 from Forbes et al. (2013).
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