Radial profiles of C₂H emission compared to the work of Facchini et al. (2021). In panel a, we show the emission from the preferred disk model of Fig. 4c, which has C/O = 1.01. The peak flux is slight overestimated, but it reproduces the peak location better than models with lower C/O. In panel b we show the same disk model, but with O/H = 2.525 × 10⁻⁴, so that C/O = 0.4. The peak flux is suppressed and the peak moves inward. In this model, the inner disk dominates the C₂H flux. In panel c, we set C/H = 1.1 × 10⁻⁴ and O/H = 1.0 × 10⁻⁴ such that C/O = 1.1. We find that the predicted flux greatly overestimates the observed C₂H flux.