Dependence of cold-disk fraction (within 1R_e) on galaxy stellar mass and infall time. Left panel: cold-disk fraction of the sample galaxies as a function of stellar mass, color-coded by infall time into the Fornax Cluster to highlight the ancient (red), intermediate (white), and recent (blue) infallers. Gray symbols correspond to the four LTGs without colored model which are considered as recent infallers. The gray curve represents the cold-disk fraction with 1R_e of CALIFA galaxies (Zhu et al. 2018b). Circles and crosses correspond to galaxies with extended and concentrated dynamically cold disks, respectively. Right panel: cold-disk fraction within 1R_e as a function of infall time color-coded by stellar mass, divided into three mass bins: log M_*/M_⊙ < 9.2 (light blue), 9.2 < log M_*/M_⊙ < 10 (blue), and log M_*/M_⊙ > 10 (dark blue). The four LTGs without colored model are plotted with an infall time upper limit of 4 Gyr ago.