Fig. B.1
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Some primary standards illustrating the intermediate type of ρ Aur. At the very high S/N of these spectra, Si III 4553 Å is still visible in both η Aur and ρ Aur, allowing a clear comparison against neighbouring Fe lines. Reclassification of ρ Aur as B4 V is still compatible with its role as anchor standard of the MK system, as this subtype is not used in either MK73 or MK78.
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