Markov-chain Monte Carlo sampling of the rotational, shape, and photometric phase-curve parameters for asteroid (21) Lutetia. The marginal probabilitity densities are characterized by an unbiased sub-sample of 1000 parameter sets selected from the complete sample of 30 000 parameter sets. We depict rotational pole longitude (λ) and latitude (β) vs. rotation period (P; up to the left and middle, respectively), pole longitude vs. pole latitude (up to the right), example spherical harmonics coefficients a₂₀ and b₂₁ vs. rotation period (down to the left and middle, respectively), and photometric slope (β_S) vs. rotationperiod (down to the right). The red, dotted line marks the least squares rotation period from convex inversion.