Fig. 1
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Examples of normalised spectra of the spectral sequence of stars investigated here, arranged from hottest (top) to coolest (bottom). Displayed are three spectral windows, around Ηδ (left), He II λ4686 Å (middle), and Hα (right panel). The major spectral features are identified; the sharp absorption lines around Hα are telluric H2O features.
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