Fig. 15
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Half-light radii as a function of absolute V-band magnitude for the old cluster sample, and for the sample of GCs from (Georgiev et al. 2009). The empirical relation log10(Rh/pc) = 0.25 MV + 2.95 (Mackey & van den Bergh 2005), which defines the upper envelope of MW GCs, is overplotted. Small red circles mark the three most extended clusters in NGC 6822.
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