From the upper to lower panels: a) the amplitude spectrum of the CoRoT ID 0101368812 light curve; b) the amplitude spectrum after prewhitening of the first overtone radial frequency and its harmonics; c) after prewhitening of the first overtone and the fundamental radial frequencies and their harmonics and their linear combination terms; and d) the residuals after prewhitening with all frequencies in Table 3. The dashed curve shows the noise level that corresponds to the level of the weakest amplitude in the data.