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Fig. 1.

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Ultraviolet and optical spectra of Fairall 9 obtained with the HST Faint Object Spectrograph on 1993 January 21 and with the ESO 1.5 m telescope on 1994 July 14, respectively. Overplotted are the transmission curves of the OCM filters (u, v, b, y, and I) used for photometric observations in our HALO program, along with the transmission curves of Swift-UVOT filters (W2, M2, W1, U, B, and V) employed in constructing the photometric light curves in the literature.

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