Detection of the TRGB with our method for the LMC (left column of panels) and the SMC (right column of panels), for, from the upper to the lower row of panels, SDSS i, SDSS z, NGRST (WFIRST) Z087 and Euclid-VIS I_E passbands, as a function of a colour in the respective photometric systems (except for Euclid, as I_E is the only passband of the system that is completely enclosed in the spectral range of Gaia XP spectra; in this case we used the V-I colour). The arrangement and the meaning of the symbols are the same as in Fig. 3.