Example photometric lightcurves for asteroid (21) Lutetia. We show the ground-based photometric lightcurves#41 and #3 and the Gaia lightcurve (blue circles; left, middle, and right, respectively; see Table A.1) together with the best-fit convex model lightcurves (red crosses) with 1-σ standard deviations (red bars) and uncertainty envelopes using all 30 000 MCMC sample solutions (red points). m, t, and k stand for relative magnitude, time from the first lightcurve observation, and lightcurve observation counter, respectively.