O − C diagram for the ExtEEV (top) and residuals from the fitted parabolic model (bottom). The values of O − C for the ground-based surveys and TESS mission are marked with different colours presented in the legend. For TESS data, we provide two types of O − C values. Black points correspond to the global fit to TESS year 1 and 3 data, while grey points represent O − C derived from the observed times of minimum light (bottom part of Table 6). Epoch E stands for the number of orbital cycles that elapsed from the reference time of minimum light, T_ref = BJD 2458340.66829. The fitted parabolic model is shown with a solid black line. The blueish shaded areas around the solid and dashed lines denote 1σ confidence intervals of the best fit.