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Fig. 6.

image

Stellar mass and metallicity of DF2 and UDGs from the literature (Gu et al. 2018; Ferré-Mateu et al. 2018; Ruiz-Lara et al. 2018; Pandya et al. 2018). We show the location of DF2 for two mass estimates, corresponding to the two distance estimates of 13 and 20 Mpc (see text). The empirical mass–metallicity relations for low-mass and high-mass systems (from Kirby et al. 2013 and Gallazzi et al. 2005, respectively) are shown in gray and orange.

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