Fluctuations in the apparent magnitude (top row), Hubble rate (middle row), and angular diameter distance (bottom row) for the ΛLTB model as compared to the fiducial ΛCDM one. The 68% and 95% bands are obtained by evaluating the relevant functions at every point of the chains. The red points show LSST and Euclid DESIRE SN data, the black ones Euclid data, and the purple ones DESI data. See Sect. 6.1.