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Fig. 2.
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Sample spectra spanning B3, B5, B7, and B9 subtypes, arranged from top to bottom. The key spectral lines He I 4026, 4121, 4471, 4713, Hδ 4101, Hγ 4340, and Mg II 4481 are labeled to highlight their variations across different subtypes. The RA and Dec of each target are listed below the corresponding spectrum.
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