Fig. 1.
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Example TESS QLP light curves and residual spectra for Cepheids with additional signals. Note that the frequency ranges in the right panels are different. Dashed red lines mark the positions of the subtracted frequencies of the first overtone mode (f1O, 2f1O, 3f1O). The low-amplitude peaks identified are labeled. fsh denotes the subharmonic frequency of the f0.61 peak.
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