RX J0154.0–5947. Left, top: mean spectra of the observations on 23 August 1993 and 24 November 1995. Second from top: He IIλ4686 radial velocities obtained from the 17 December 1993 spectrophotometry with fitted sinusoid superimposed. Third from top: He IIλ4686 line profiles at maximum blueshift (blue curve) and redshift (red curve). Bottom: O − C diagram for the times of orbital minimum. Right, top: overall spectral energy distribution (see text). Bottom set of four panels: spectral flux in the B band of 17 December 1993 with peak magnitude B = 16.3, Sloan r light curve of 29 August 2015 with peak brightness r = 14.9, WL relative flux on 5 May 2018, reaching magnitude w = 15.2, and ROSAT X-ray light curves taken with the PSPC in the intermediate state of 1−2 July 1992 and with the HRI in the high state of 3−7 January 1995. All light curves are phased on the ephemeris of Eq. (4).