Time evolution of the photosphere mass coordinate (panel a), the radius of the photosphere (panel b), the effective temperature of the photosphere (panel c), and the photospheric velocity (panel d). The light dashed lines indicate the phase when the photosphere temperature drops below 10^3.75 K. At this point, SNEC has difficulties estimating the exact location of the photosphere (Morozova et al. 2015). The dash-dotted line illustrates the hydrostatic progenitor. The inset shows the radius evolution of one pulsation cycle and indicates the points A–F.