Resulting atmospheric C/O for a range of planets with different starting radii. The orbital migration is neglected for these growing planets, hence they sample the gas at their position. The 2D accretion model is on the left, and the 1D accretion model is on the right. The evolution of atmospheric C/O is colour-coded (see legend). The C/O of the disk volatiles before any chemistry partitioning of carbon and oxygen between gas and ice occurs is denoted by the dashed line.