Mid-eclipse time delays for different orbital solutions in units of seconds. (a) Time delays obtained by adopting T₀ = 54112.831979 MJD for the reference time and P₀ = 3.28106345 as the orbital period (top panel). The best-fit curve (red) is described in the text. O−C values are in units of σ (bottom panel). (b) Time delays obtained by subtracting the eccentric sinusoidal modulation (top panel). The best-fit curve is described by Eq. (2). Corresponding O−C values are in seconds (bottom panel).