Excitation Fe II in the three LVCs. Top: comparison of the excitation diagram of Fe II measured in the three LVCs (dots with error bars) with the result from our excitation model (crosses). For clarity, we only show levels with significant detections. The solid black line indicates the excitation temperature measured by Vrignaud & Lecavelier des Etangs (2024) in a β Pic exocomet observed on December 6, 1997, and located <0.4 au from the star. By comparison, LVCs #1 and #3 (blue and orange dots) are at located at ~1 au; and LVCs #2 (green dots) is much farther away (4.7 au). Bottom: ratio of the measured and modelled abundances of the studied Fe II levels. The horizontal dotted line indicates the ratio of 1.