Luminosity specific PNe number α as a function of metallicity for the best-fitting single-age stellar population to selected spectral regions (top panel) following Martín-Navarro et al. (2019) and for the light-weighted metallicity resulting from a full spectral fitting (bottom panel) following P19. Circles and triangles show values from in-plane and off-plane regions, respectively whereas filled and open symbols denote whether these were found within our central or halo MUSE pointings. The colour of the symbols indicate measurements from each galaxy, with dashed lines showing linear fits to all values for each object.