Abundance analysis for the stars listed in Table 7, plus S22, the star used by previous authors to derive abundances in Do 25. The left panel shows the region of the Si iv 4116 Å line; the middle panel shows the Si iii triplet, while the right panel shows two representative O ii lines. For each star, we display three models, calculated using the same stellar parameters, but with different abundances. The red model uses solar abundances (8.75 dex for O and 7.50 dex for Si); the blue model uses abundances 0.3 dex lower, while the green model uses abundances 0.6 dex below solar.