Observed G magnitudes of asteroid (21) Lutetia included in Gaia DR3 as a function of days after the first observation (t₀, top left) and against the phase angle (α, top right) together with the modelled magnitudes. The bottom left panel shows the same as in top right panel, but only for the observations concerning the Lutetia hemisphere observed by Rosetta. The bottom right panel shows the same as in the top right panel, but only for the observations of the Lutetia hemisphere that was not observed by Rosetta.