Oxygen abundances determined from the individual OH UV lines using a classical 1D (ATLAS9, left column) and corrected for 3D hydrodynamical effects using a CO⁵BOLD model atmosphere (right column). The top, middle, and bottom panels show A(O) plotted versus excitation potential, χ, line equivalent width, W_i, and wavelength, λ, respectively. Different symbols indicate spectral lines of different quality where A-class lines are the best/cleanest (see Sect. 2.4.1 for details). All derived abundances are provided in Appendix A.