Hertzsprung–Russell (top panel) and mass–radius (bottom panel) diagrams, including the components of all studied systems (colored filled and empty circles), along with other δ Sct components of detached binaries with P_orb < 13 d (star symbols) and P_orb > 13 d (diamond symbols). Moreover, in the mass-radius diagram the δ Sct stars of SB2+E systems (black star and diamond symbols) are distinguished from those that are members of other type of binaries (gray star and diamond symbols). The data of the binary δ Sct stars were taken from Liakos & Niarchos (2017), Liakos (2020), and Liakos (2025). The boundaries of the instability strip (IS) were taken from Soydugan et al. (2006b) and the theoretical stellar evolutionary tracks from Girardi et al. (2000).