[O/Fe] vs. [Fe/H] of DLAs and sub-DLAs. Blue data are from the literature compilation in Welsh et al. (2022) and the red points are the data presented in that work. The orange points are the DLAs presented in this work combined with the results of Welsh et al. (2023). The arrows represent systems with Fe II column densities known as upper limits. Note that we do not plot the abundances of J2150+0331 in this figure since the column density of neutral hydrogen does not meet the criteria of log₁₀N(H I)/cm⁻² > 20.0 (within the associated errors). The abundances of metal-poor stars are shown as gray symbols.