Fig. D.1.

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TESS photometry and contemporaneous spectroscopy for two Be stars, 25 Ori (top) and V434 Aur (bottom). The left panels show the TESS light curve from the indicated sector (at the top left), with triangles corresponding to dates of NRES spectroscopic observations. The middle panels show the spectral region centred on Hα for each spectroscopic epoch shown in the left panels. The right panels contain the frequency spectra built from the TESS photometry.
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