Line-of-sight (LoS) velocity 450 yr after SN explosion. The average density-weighted LoS velocity is displayed both for the nonturbulent (a, b) and turbulent (c, d) cases. The calculation of the LoS velocity uses either the shocked shell contained between BW and RS (a, c) or the shocked ejecta contained between CD and RS (b, d). Both idealised values (blue) and simulated values (orange) of the velocity and density are considered for the calculation.