Period-luminosity relations for stars with modes of different degrees: l = 0 (green), l = 1 (blue), and l = 2 (orange). The period-luminosity relations include only the radial fundamental mode (n = 0) for radial pulsators and p-modes for the non-radial pulsators. The black line shows the relation of the Shi et al. (2024) sample. For comparison, a similar period-luminosity relation for our sample is plotted in purple (dashed). The green shaded area shows the uncertainty band of the fundamental radial-mode pulsators. The small black data points in the background show dominant g-mode and higher-order radial pulsators excluded from the fits.