  Light curves of AM CVn are analyzed by decomposing them into their Fourier
components. The amplitudes of the fundamental mode and overtones of the three
components: the superhumps, the negative superhumps and the orbital variations,
are found to be variable. This implies that variations in the shape of the
observed light curve of AM CVn are not only due to the interference between
those components, but also due to the variability of their parameters.
