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Rich regular frequency patterns were found in the Fourier spectra oflow-amplitude delta Scuti stars observed by CoRoT satellite (see Papar\'o etal. 2016a,b). The CoRoT observations are, however, influenced by the disturbingeffect of the South Atlantic Anomaly. The effect is marginal for high amplitudevariable stars but it could be critical in the case of low amplitude variables,especially if the frequency range of the intrinsic variation overlaps theinterval of the instrumental frequencies. Some tests were carried out both onsynthetic and real data for distinguishing technical and stars' frequencies.

How to separate the low amplitude delta Scuti variation from the instrumental ones in CoRoT data?