Based on observations collected at ESO in programmes:056.E-0665, 59.E-0350, 62.L-0654 and 165.L-0263.

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Appendix A is only available in electronic form at http://www.edpsciences.org

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...Wiese et al. (1969)

They used the values of VALD database which for S I contains the data in Kurucz (1993), which, in turn, contains the Wiese et al. (1969) measurements.

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... correlated

In fact, on the one hand, in most spectrographs the slit projects on at least two pixels, thus making the signal in neighbouring pixels correlated; on the other hand, one usually works on spectra which were rebinned to a constant wavelength step, in order to allow the coaddition of different spectra, often with an oversampling factor of at least 2. Therefore neighbouring pixels are strongly correlated.

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... I lines

At our resolution, the fine structure is not resolved, although the "lines'' are really a blend of three lines.

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... for 36 stars

A slightly different setting was used in the different runs of programme 165.L-0263 and the setting used in the first run did not cover the region of the S I Mult. 1 lines.

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