Limb measurements for Atlas (Ia) and Prometheus (IIa). The background is an image coming from ISS (N1560303820 for Atlas and N1640506063 for Prometheus) and the yellow points represent the observed limb deduced from Caviar software and the red points are the shape model deduced from the SH analysis. The left panels (Ib) and (IIb) represent the residues between the observed limb and shape model expressed in kilometers. In the label, we note the root mean square (rms), the standard deviation σ and the scaling factor R.