Left: Edges of the 95% credible interval on the WDM mass m_wdm and fraction f_wdm for the CWDM model, with pessimistic assumptions and three data combinations: WL alone, WL plus GC from the photometric survey (3 × 2pt), and 3 × 2pt combined with Planck CMB data. For the 3 × 2pt and 3 × 2pt + Planck data sets, baryonic feedback has been assumed to affect the WL power spectrum but not the GC power spectrum. The posterior is marginalised over other cosmological parameters, baryonic feedback parameters, and nuisance parameters (accounting for bias uncertainty and intrinsic alignment). The model is equivalent to pure ΛCDM towards the lower horizontal axis (small f_wdm) and right vertical axis (large m_wdm). The forecast assumes a flat prior on the mass of thermal WDM (lower axis) and a logarithmic prior on the WDM fraction (left axis), but we show the relation to Dodelson–Widrow masses in the upper axis (see Sect. 2.1 for definitions). Right: Same with optimistic assumptions.