Compilation of continuum-subtracted Mg II pseudo-narrowband images (gray color scale) and HST F814W images (blue color scale, probing the stellar light) for our final sample of galaxies that exhibit a P-Cygni profile in Mg II as well as a significant detection of extended Mg II emission. Galaxies are sorted by stellar mass in descending order. The continuum-subtracted Mg II pseudo-narrowband images were computed by collapsing the MUSE data across the wavelength axis for wavelengths that enclose the full P-Cygni profile of the Mg II doublet for a field of view of 80 × 80 kpc². The brown circle in the bottom-left part of the panel shows the size of the MUSE PSF. The black contours show the 1-σ and 2-σ detection levels of Mg II net emission in the pseudo-narrowband images. The red contours show the 2-σ and 4-σ levels of Mg II net absorption in the pseudo-narrowband images. For visualization purposes, the continuum-subtracted Mg II pseudo-narrowband images have been smoothed using a Gaussian kernel with a FWHM of 1 arcsec. For each galaxy, we also show the radial profile of the Mg II emission as observed in the data (solid) and after correcting by self-absorption using our best-fitting model (dashed; see Sec. 4). The vertical dotted brown line shows the half-light radius measured for the self-absorption corrected radial profiles. The inset shows the Mg II spectrum extracted from the MUSE data cube for each galaxy, across the full modeled region (black) and a small central aperture of radius $0\stackrel{″}{.}4$. The figure is continued with the rest of our sample galaxies in Appendix A.