Implications of two-body decay on clustering amplitude σ₈ and on S₈ parameter from our analysis of CMB and WL data. Left: Two-dimensional posterior contours (68% and 95% confidence levels) of the Ω_m − σ₈ plane from our MCMC runs for the ΛCDM and DDM scenario. Results from KiDS-1000 are shown in blue and green, and results from Planck 2018 are shown in black and yellow. The combined CMB+WL analysis is shown in red and purple. Right: One-dimensional constraints of the S₈ parameter for the same models. The original results from the KiDS-1000 (Asgari et al. 2021, A21) and the Planck 2018 (Planck Collaboration VI 2020, P20b) analyses are added in grey and blue for comparison.