2D histogram that shows the distribution of stellar velocity dispersion (σ_*) and log age (luminosity-weighted), for NGC 1365 (left), NGC 1566 (center), and NGC 3627 (right). The color of each [LumW log Age, σ_*] bin scales with the number of pixels within that bin. The contours show the one- and two-sigma limits of the distribution of each individual galactic environment, following the color code indicated in the top-right corner of the right of the panel.