Fit of our toy model for an half ring to the phase-averaged Hα profile for ZTF J2008+4449. The left plots are for optically thin emission, the middle are for optically thick and the right ones are for a mix of optically thin and optically thick emission. The upper panels show the phase-resolved profiles for each model, the middle panels show the best fit phase-averaged compared to the data and the lower panels show the residuals and the reduced χ² for each fit. It can be seen that the mixed model is a marginally better fit to the data than the optically thin model, and both are much better fits than the fully optically thick model.