Top panel: most likely column-integrated volume densities of aerosol particles as a function of radius for Run A (blue, solid), Run A alternate (blue, dot-dashed), Run B (green) and Run C (orange). The volume density with uniform probabilities (black) and the distribution used in the current sky background model (default, pink) are also shown. The same analysis, but without the dust particles is shown for all three runs and with uniform probability (dashed). Bottom panel: relative error, given by σ_x/ < x >.