Left: measured R filter ΣAf in function of the projected nucleocentric distance ρ for observations at r_h  ≈  2.3 AU together with the model functions. Crosses represent the measurements, the solid line shows the total model function, the dashed line gives the part related to N_c+N_l and the dotted line that of N_s. The “bumps” (for instance, that at about 32 000 km) are caused by the remnant flux from background stars, easily identifiable by eye in the images. Note that the profile was modeled up to 10⁵ km, but here a smaller part is shown. Right: measured Afρ function for the same date and filter. This shows that the Afρ strongly depends on ρ and consequently it cannot be used as proxy of the dust production.