Evolution of GW amplitude for models s0.0-1 (A), s1.0-1 (B), and s2.0-1 (C). Panels from top to bottom show the time evolution of the GW amplitude for the whole simulation domain, PNS core, sonic envelope, and outer layers. Finally, the bottom row shows the space-time evolution of 𝒟h(t, r). Dashed, solid, and dotted lines represent the PNS core, sonic envelope, and PNS average radius, respectively. Grey shades mark regions where N² < 0, i.e. approximately, regions where convection takes place. Numbered ellipses identify GW modes in each region (see text).