Measured global MZR of all galaxies in the sample from stacked spectra (top plots) and assigning global median metallicity values (bottom plots) of tails (red with orange fit) and disks (dark blue with blue fit) via a second-order polynomial fit. The left and right panels show the PYQZ and P04 MZR, respectively. In both panels, error bars represent the metallicity uncertainty as discussed before. Additionally, due to the lack of usable individual spaxels in A2744-01, there is no median metallicity value available for the disk of this galaxy. In the right panels the metallicity of A2744-10’s tail (i.e., the one with a steep positive gradient in Fig. 10) is higher than the disk’s by 0.11 dex, which is exceptional. The solid black line represents the Kewley & Ellison (2008) MZR fit, with the 0.1 dex uncertainty illustrated with the blue shaded area.