The adsorptive landscape for isolated C atoms was explored in earlier works using the very same TM surface models and computational setup, with the caveat that were carried out neglecting long-range interactions . Thus, the most stable configurations were taken from literature and recalculated at PBE-D3 level, alongside the here calculated O adatom situations, see Tables only that in the C+O the C atom is located at the formed square. As found for C and O adatoms , and shown for CO adsorbate, the εd descriptor is the most suited as well for the C+O coadsorption, as seen in Fig. , where the similarity is evident, again best performing for fcc an hcp TM surfaces, with R values of 0.912 and 0.929, respectively, but with less accuracy for bcc TM surfaces, with an R of 0.758.