The modulations of selected frequencies, as determined from their sidelobes identified in the ‘pri’ and ‘sec’ spectra involving primary or secondary eclipses, respectively. Every row contains data for one frequency, marked in the leftmost panels. From left to right: columns 1 and 2 – data (peaks + their synthetic signals) for primary eclipses; columns 3 and 4 – same for secondary eclipses. We note that the peak amplitudes in the frequency spectra are plotted on a nonlinear – square root – scale in order to make the smallest peaks visible. Black upside down triangles mark the central peaks. Dashed vertical lines in the light curve panels (columns 2 and 4) mark the eclipse regions.