Gaseous C/O ratios as a function of disc radius and time for discs with internal photoevaporation due to X-rays and a host star mass of 0.5 M_⊙. This plot shows a comparison between different α values and different photoevaporation rates, with the left column depicting α = 10⁻⁴, the right column depicting α = 10³, the top row showing our nominal photoevaporation rate of Ṁ_w = 1.90460 · 10⁸ M_⊙yr⁻¹ (see also Table 1), and the bottom row showing a reduced photoevaporation rate of Ṁ_w = 0.51324 · 10⁻⁸ M_⊙ yr⁻¹ (see also Table 2). Colour coding, plotting, and remaining simulation parameters are indicated as in Figure 3.