Portion of the spectra of three RHB stars of 47 Tuc (#92985: upper row; #81468: middle row; #44226: lower row). The first two spectra are offset vertically for clarity. These spectra have been shifted at zero radial velocity; telluric features are excised following the technique described in the text. Dashed lines mark the NaI doublet at 8183-94 Å; the dotted line marks the strongest CN line in this spectral region (many other CN lines are present). Note that #81468 is a C-star, discussed in Sect. 4.8.