Time delays of F1 and F2 computed with the modified phase modulation method (see text for the details). The blue and red filled circles correspond to F1 (f = 187.65 f_orb) and F2 (f = 193.95 f_orb), respectively. The continuous and dotted grey lines show the theoretical time delays of the primary and secondary components, respectively, which were computed from line-of-sight distances modelled by the second generation of PHOEBE (Prša et al. 2016).