Velocity of the shock wave as a function of the mass coordinate at different times after the onset of the explosion. The end of the explosive nucleosynthesis (dotted blue line), the shock wave enters the CO core (dash-dotted orange line), the shock wave reaches the He/H interface (solid green line), 1000 s after the onset of the explosion (dashed red line), the formation of the compact remnant (long dashed purple line), and the shock breakout (short dot-dashed light green line). The shaded purple area represents the extension of the final compact remnant.