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Fig. 6

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Top: comparison of our high-resolution equivalent widths (in Å) of He I λ4471 (asterisks) and He II λ4541 (diamonds) with those from Mathys (1988), for nine stars in common. Dotted lines represent linear fits to the corresponding data. Note the non-zero offset in the EW scale of He II λ4541 . Bottom: comparison of the corresponding high-resolution quantitative spectral types. Spectroscopic binaries are highlighted by either large circles (top panel) or filled diamonds (bottom panel).

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