Asteroid (100) Hekate. Left, from top to bottom: observation to model ratios versus wavelength, heliocentric distance, rotational phase, and phase angle. Depending on the plot, the colour indicates the aspect angle or wavelength at which the observations were taken (see the legend on the right). The plots for AM 1 looked similar. Right: χ² versus thermal inertia curves for (100) Hekate model 1 (top) and model 2 (bottom). In all the subsequent figures of this kind, the colours denote optimised diameter, while various symbols show various levels of surface roughness.