Fig. 2.
Top: phase diagram for periodic wave-like variations in the ASASSN V and mpg LCs of V426 Sge according to the ephemeris (1). Grey lines represent their sinusoidal fits. Middle: corresponding colour index mpg − V illustrated by the black line inside the grey belt (= its uncertainty) (Sect. 3.1.2). Bottom: photographic magnitudes prior to the 1968 outburst phased with the ephemeris (1). The LCs do not show any sinusoidal light variation along the orbit (Sect. 4.3.1).
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