Left panel: radial intensity profile of NIRS3 at 2.32 mm (orange circles with error bars showing the rms azimuthal scatter). The dashed purple curve shows the beam profile (2﹩\mathop{.}\limits^{\unicode{x02033}}﹩30 × 1﹩\mathop{.}\limits^{\unicode{x02033}}﹩28). Colored lines represent the best-fit models: single power law (red), single Plummer (green), broken power law (blue), double Plummer (black), and Plummer + Gaussian (magenta). Right panel: residuals (data – model) expressed as a percentage of the data for each model. Lower panels: individual fits of all five models.