Fourier spectrum of KIC 11294808. Frequencies that fulfil our detection criterion, are indicated in black, whereas frequencies marked in red fulfil the detection criterion, have the first-order harmonic within the extracted frequency list, and are part of a closely spaced group of frequencies. The derived near-core rotation frequency and its harmonic are indicated with the dashed and dotted lines, respectively. Signatures of rotational modulation occur within the shaded grey frequency range.