Fig. 1
Portions of the spectra of the RHB star #8342 (left column) and of the BHB star #7189 (right column). From top to bottom: the regions including the O I triplet at 7771-74 Å, the Na D lines at 5890-96 Å, and the Na doublet at 8183-94 Å. The spectra in the region of the O I triplet have been smoothed by a Gaussian with FWHM = 0.3 Å. The Na D interstellar lines are clearly visible in the median panels.
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