Period spacing versus period for p modes (circles) and g modes (squares) corresponding to the δ Sct models (upper panel), and to the pre-ELMV models (lower panel). The asymptotic period spacing for g modes is depicted as a reference with thin horizontal continuous and dashed lines for the cool and hot models, respectively. Selected periods with consecutive radial orders are marked with magenta squares. They correspond to p modes for the δ Sct model, and to g modes for the pre-ELMV model (see text for details).