Distributions 1/a_ori for two samples of LPCs: small perihelion comets (green line histogram in the upper panels) and large perihelion comets (full blue histogram in the upper panels) and the sum of all LPCs included in the CODE catalogue (full red histogram in the lower panels); swarms of 5001 VCs were used, with a bin width of 10 au₋₆. Left panels show statistics using the ‘preferred’ orbits, while the right panels show statistics based on PB solutions (i.e. orbits preferred for backward orbital evolution).