Top panel: Cross-correlation templates created from the retrieved models. The observational residuals, shown in black, are the data and the best-fit model, with ¹³CO turned off, subtracted. In pink, the best-fit model is subtracted from that same model but with ¹³CO manually turned off, yielding the ¹³CO template. The dashed grey line shows the residuals when subtracting the full model from the data. Bottom panel: Observational uncertainties, by which we weighted the residuals. Right panel: Cross-correlation function for each of the residuals with the ¹³CO template. The CCF between the ¹³CO residuals remaining in the data and the ¹³CO template is shown in pink, while the dot-dashed black line shows the cross-correlation between the full model residuals and the ¹³CO template. The autocorrelation of the ¹³CO signal is shown with the dashed light-pink line.