Spectrum of BD–18 5550 in the region of Mult. 1 of S I. Only the main line can be measured in our spectrum, as the others are severely blended with telluric lines. The thick line shows the theoretical profile computed with our value of the S abundance (Table 3). The profile computed with the abundance adopted by Takeda & Takada-Hidai (2011) (thin line), is not compatible with the observed spectrum.