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Description
The 270 spectra enclosed are those used in the atlas and are described in the Table 1 of the paper: stars with magnitudes and spectral types, dates of observations and other data. All are normalized and corrected from the radial velocity due to Earth movement, but not corrected from the radial velocity of the star itself. The heliocentric Julian day of the mid-exposure appears in the header with a comment keyword. Very often it cannot be derived by a simple formula from the beginning and the time exposure, when the spectrum is the result of the sum of several successive ones, or when clouds have obliged to interrupt the exposure. For this reason, it is always indicated. The HD number of the star appears always in the name of the file, with additional letters to distinguish the different spectra of a same star. The tracings of the atlas (72 FITS files) are described in the subsection 2.4 of the paper and available with the electronic version.
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