Fig. 3.
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Details of [N II]λλ6548,6583 emission line profiles in the three epochs around the HVC observed in 1993 (arrowed). The C II emission line seems to be redshifted in the 1993 spectrum as compared with the 2019 and 2020 ones. The very poor S/N in the 1993 spectrum of this line does not allow us to state whether this shift is real.
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