Location of Fornax and Hydra dwarfs on the mass-metallicity diagram populated by the LV star-forming dwarfs and Virgo star-forming dwarfs. With a solid line, we draw the LV fit for the star-forming galaxies (dIs and BCDs), with a dotted line the similar Virgo fit and with a dashed line the Hydra fit. Both Virgo and Hydra samples give a fit with a steeper slope than the LV one, suggesting that more metal-rich star-forming dwarfs tend to occupy regions of higher galaxy density.
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