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Oscillation spectra of six red giants observed with Kepler. The stars are ordered in three pairs, each representing a different evolution stage ranging from the most evolved (lowest oscillation frequencies) on the left to the least evolved (highest frequencies) to the right. For clarity the spectra are smoothed by 3\% of the frequency separation between overtone modes, which for the most evolved stars tend to create a single peak for each acoustic resonance, even if it comprises multiple closely-spaced mixed modes (red peaks in the left and centre panels). The coloured regions mark the power dominated by modes of different degree $\ell=0$--3. The slightly downward sloping horizontal dashed line indicates the noise level. Observations of each star were made during the first 37 months of the Kepler mission. mission (Q0-Q14).