Distribution of nova systems from Kemp et al. (2021) in the space of the minimum separation between the nova and the tertiary (a_outer,min) for the stability of the triple-star system and the number of nova explosions (N_nova). The dashed blue line corresponds to the condition Eq. (7), while the solid blue line marks the selection of promising models. The reason for the use of the solid line instead of the dashed line is explained in the text.