Test of the Campins et al. (2009) solutions against our large thermal data set. Top left: observation-to-TPM flux ratios as a function of phase angle; top right: as a function of wavelength; bottom: same as top, but now calculated for the lower thermal inertia limit of 150 J m^-2 s^-0.5 K^-1 and the extreme case of an equatorial retrograde geometry (at the time of IRS observations and as seen from Spitzer).