2MASS colour–magnitude diagrams (set of panels on the left) and Gaia-2MASS diagram (set of panels on the right) of SRVs and Miras in the sample adopted here, limited to the LMC. Each panel in a given set corresponds to a different group of LPVs, according to the classification described in Sect. 3.2. The SRV-0 group is split into SRV-0⁻ and SRV-0⁺ (see Sect. 4.1). The lines drawn to facilitate the comparison between 2MASS CMDs represent the RGB tip (dashed) and lines K₁, K₂ from Cioni et al. (2006), while lines in the Gaia-2MASS diagrams are from Lebzelter et al. (2019). We note that in both diagrams the horizontal range is truncated in order to focus on the region populated by SRVs, while Miras (and a few SRVs) extend as far as J − K_s ≃ 5 mag and W_BP, RP − W_J, Ks ≃ 9 mag. Gaia EDR3 photometry is used to compute W_BP, RP.