Mass-weighted distribution (in terms of probability distribution function, PDF) of disk stars in the [Mg/Fe]–[Fe/H] plane, for four galaxies in our sample. Each row corresponds to one galaxy (see bottom left corner of the leftmost panels). From left to right, first column: Properties of individual star particles. Second to fourth columns: Stellar properties in mock edge-on IFS maps, using different Voronoi binning levels. Average bin sizes range from 0.3 to 2.1 kpc (indicated at the top of each panel). Fifth column: One-dimensional PDFs of [Mg/Fe] abundances for individual star particles in the leftmost panels (black dotted lines), and for Voronoi bins in the second column from left (green solid lines). All PDFs are shown in logarithmic scale. Red and blue (pink and cyan) contours in the two-dimensional distributions enclose the 50% (16%) highest-density points, respectively in the thick and the thin disks. The remaining 20 galaxies in the sample are displayed in Appendix A.