Normalised light curve as reduced from MOST photometry, but without intervals of primary and secondary eclipses (top panel), together with the corresponding period P₀ (middle) and amplitude A₀ (bottom) of the harmonic function f(t) = 1 + C₀ + A₀sin [ 2π(t−T₀) /P₀ + φ₀ ], which was sequentially fitted to the light curve, always in limited intervals ΔE₁ = 0.5 of the epoch (indicated by the black double arrow), shifted with a step ΔE₂ = 0.05. The oscillations exhibit both frequency and amplitude modulations, with periods spanning P₀ = (0.42 ± 0.01) d and amplitudes A₀ = (0.00060 ± 0.00015) mag. It seems that the longest P₀ and the largest A₀ are observed at around primary eclipses and vice versa.