Sky maps towards M31 (left panel), M33 (central panel), and Fornax dSph (right panel). Gaia DR3 LPV candidates are colour-coded according to their median G-band magnitude, and a sample of Gaia EDR3 sources is displayed as grey symbols in the background for reference. Solid lines represent the cuts in equatorial coordinates that we applied to select sources in each galaxy (see Table C.2).