Estimation of limit brightness and visible aggregates. Top: cumulative distribution of phase-function-corrected track brightness for images obtained for set STP096 using the Red filter. The dashed line indicates the best fit for the linear part, while the dotted black line shows the minimum brightness for which the sample is complete. Bottom: fraction of aggregates with brightness higher than B_lim at a distance ≤ζ_max from the spacecraft, assuming a stationary coma model.