Observed (dots with error bars) and synthetic spectra (lines) around the Pt line at 3301.87 Å for abundances of log  ϵ(Pt) = −0.3, −0.2, 0.0, + 0.2, and + 0.3 (green and red full and dashed curves). In addition, a synthesis with no Pt (black full line) shows the prominent OH blend, while the upper dotted blue curve shows a synthesis without Pt and OH, revealing a faint Er ii line in the red wing of the feature, which has no impact on the Pt abundance determination.