Comparison of the Hα emission line profiles, scaled to the same energetic units in the bright and faint states. Upper panel: the Hα emission line profiles in the normal bright state (blue) at V = 10.55 mag and two different faint states (red) of UX Ori. The epochs of each profile are given in the plots. In the two faint states the photometric measurement are (a) V = 12.48 mag and (b) V = 11.70 mag. Lower panel: same as in the upper panel, but for bright and faint states of RR Tau observed in 2019 (c) and 2022 (d). The photometric measurement in the bright and faint states are V = 10.86 mag and V = 13.77 mag (c), and V = 10.66 mag and V = 13.85 mag (d); see text for details.