Phase of the secondary minimum (labelled values are 0.40−0.46; the observed phase is 0.436) and ratio of minima durations (with labelled values 1.3−1.7; the observed ratio is 1.462). The lines are valid for an inclination angle of  ~90°. Thick solid lines represent the observed values and their intersection indicates that e = 0.20−0.22 and ω = 115−120°. The resulting orientation and eccentricity of the orbit plotted for simple BF modelling (Sect. 3.2) and ROCHE modelling (Sect. 3.3) shows that i < 90°.