Bottom left: soft X-ray light curve of V358 Aqr observed during the RASS in December 1990. Top left: high-state V-band light curve of 23 September 1998 and BVRI light curves of 25 September 1998 reduced to V, using the mean colors. Top right: intermediate-state light curves measured in WL in 2010, 2011, and 2016, shifted vertically to avoid overlap. Bottom right: O–C diagram, displaying the deviations of the times of the primary photometric minimum from the linear ephemeris of Eq. (1). The two data points indicated by crosses have been excluded from the linear fit that yields the ephemeris.