Top panel: Distribution of host galaxy stellar mass. Bottom panel: Bulge-to-disc (B/D) mass ratio of host galaxies as a function of stellar mass. Indigo diamonds show the relation from Méndez-Abreu et al. (2021), obtained under the assumption B + D = T (see Section 3.1). Both panels display the full parent sample (black), BL sample (blue), the BD sample (orange), and, for clarity, one realisation of the CS (green). In the bottom panel, black horizontal dashed lines mark the first and fourth quantiles of the bulge-to-disc distribution, which define the division between BL and BD galaxies.