Improvement of χ² (or lack of-) when increasing the number of azimuthal modes in the fit model, the χ² containing both the terms from V² and φ_cp. We note that, in contrast with Fig. 12, the χ² for the un-modulated ring model includes the closure residuals, to be comparable to the other two fit models, with azimuthal modulation. As for Fig. 12, the objects are sorted in order of increasing size.