Top to bottom: size, mean metallicity, metallicity dispersion, and dynamical mass-to-light ratio vs. absolute magnitude, for Galactic globular clusters (black points) as well as dwarf spheroidal satellites of the Milky Way (blue points with errorbars) and M31 (red points with errorbars). Quantities plotted for Crater 2 are adopted from Torrealba et al. (2016) and this work. With the exception of metallicity dispersions, which are adopted from Kirby et al. (2008, 2010), Simon et al. (2011), and Willman & Strader (2012) data for globular clusters and dSphs are adopted, respectively, from the catalog of Harris (1996, 2010 edition; we include only clusters with velocity dispersion measurements) and the review of McConnachie (2012).