Metallicity gradient vs. galaxy stellar mass relation, where the metallicity gradient is expressed in dex kpc⁻¹ in the upper panel and in dex $R_{\mathrm{e}}^{-1}$ in the lower panel. The red circles and triangles respectively represent the galaxies with and without a regular velocity field measured in this work. The red dashed lines and shaded region represent the best fit and scatter of our sample. The green squares show the median values of metallicity gradient and their 1σ uncertainties as a function of galaxy stellar mass. Some of the results from previous studies (Ho et al. 2015; Bresolin 2019; Sánchez-Menguiano et al. 2018; Poetrodjojo et al. 2021) are also shown for comparison (see Sect. 3.3 for details).