Completeness-limit fitting for AFP dataset. The black dot represent the empirical values H_lim and uncertainties within a fixed semi-major axis interval (Δa = 0.02 au). The value of fitting is in red, while the light blue shading is the confidence interval (1σ). The dashed blue line represents the upper limit H_lim = 18.3 and lower limit H_lim = 17.3 of the fitting. Dermott et al. (2018) also estimated the completeness limit in gray. The black vertical line corresponds to the median semi-major axis (at 2.344 au) of the samples, with a fitting value of 17.62.