From top to bottom: Metallicity maps (left panels) and metallicity gradients (right panels) of the cluster-AGN host galaxy (JO49, logM_* = 10.68, z = 0.0451), cluster-SF galaxy (JO93, logM_* = 10.54, z = 0.037), field-AGN galaxy (‘8311-6104’, logM_* = 10.67, z = 0.027), and the field-SF galaxy (‘8329-12701’, logM_* = 10.99, z = 0.035), shown from top to bottom. On the left: Black contours are overplotted on the metallicity map to divide the SF, composite, and AGN-like regions, as classified by the [N II]– BPT. The gray dotted ellipses are the annuli that cover the galaxy up to R_e ∼ 2.5, proceeding with a step of 0.3 dex, except for the central annulus, which has an inner radius of r_in = 0R_e and an outer radius of r_out = 0.5R_e. Inside each annulus, the median value of the 12 + log O/H distribution is computed, along with the 25th and 75th percentiles, considering all the 12 + log O/H values inside the SF, composite, and AGN spaxels. On the right: Metallicity profile (gray line) is, obtained by joining the median values of 12 + log O/H of each annulus, plotted versus the mean value of R/R_e inside a given annulus, and t(gray line). The shaded area that covers the range of 12 + log O/H values within the 25th and 75th percentiles. In both panels, the color coding is set according to the value of 12 + log O/H, ranging from 8.0 to 9.4.