a) Fundamental metallicity relation (Mannucci et al. 2010, 2011). Our sample (circles) is compared to the incomplete sample of Mannucci et al. (2011; stars). b) Fundamental metallicity plane (FPZ) for low-mass galaxies (Hunt et al. 2016). BAT6 sample (blue) is compared to different species of low-mass galaxies (grey). The plotted relation is done with [N ii]/Hα metallicity calibration (N2; Pettini & Pagel 2004), and our data have been transformed to this calibration following Kewley & Ellison (2008).
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