Mass distributions of ejecta species as a function of LoS velocity, derived from models B18.3 (left panels) and B18.3-Dec (right panels) at a remnant age of 37 years (2024). The color bars at the bottom of the figure correspond to their respective columns and are specific to the model represented in each column. The upper panels show the velocity distributions across the entire remnant, while the middle and lower panels correspond to the northern and southern hemispheres, respectively. Crosses mark the mass-weighted average LoS velocity for each species, while the horizontal lines indicate the velocity range where the ejecta mass fraction exceeds 50% of the peak mass fraction.