Protostellar disk substructure detections as a function of disk radius, mass, and bolometric temperature. The latter was taken from the eHOPS catalog. The dashed gray lines indicate the approximate boundary between the Class 0 and Class I evolutionary phases, and between the Class I and Class II ones (Chen et al. 1995), along with the corresponding expected duration of each Class (Dunham et al. 2015). While the T_bol is not linear with age, in general the Class 0 sources have T_bol < 70 K, Class I sources have 70 < T_bol < 650 K, and Class II and Class III sources have T_bol > 650 K (Bouvier et al. 2021). The black arrow is used to indicate that the particular source has also been classified as Class II in the literature (Narayanan et al. 2023).