The combined CRIRES spectrum of HE 1327-2326 in the spectral region of the S i Mult. 3 lines. The spectrum has been shifted to zero radial velocity assuming vr = 63.8 km s-1 (Aoki et al. 2006). Below, shifted by 0.05 units in the vertical axis, the CRIRES spectrum of HD 140283 (Caffau et al. 2010) in which all three lines of Mult. 3 are clearly detected, the strongest line has an equivalent width of about 1.0 pm, only slightly larger than the upper limit we determined for HE 1327-2326.
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