Mid-eclipse time delays for different orbital solutions in units of seconds. (a) Time delays relative to the reference time T₀ = 54112.83194 MJD and the orbital period P₀ = 3.2810632 h, with best-fit linear function (top panel) and O−C values in units of σ (bottom panel). (b) Time delays based on the reference time T₀ = 54112.831977 MJD and the orbital period P₀ = 3.28106339 h, with best-fit curve as per Eq. (1) and O−C values in σ units (bottom panel).