Fourier transform of the frequencies calculated with FreqFind extracted from 4 pieces of the CoRoT data: until HJD = 3297 (top), between HJD = 3297 and 3310 (second panel), between HJD = 3310 and 3339 (third panel), and after HJD = 3339 (bottom). We adjusted the oversampling value used in FreqFind to compensate for the different length of the 4 pieces. The top panel is shown with a y-range divided by 2 compared to the other 3 panels. The red dashed lines indicate the quintuplet centered on f₆ (see text).