H₂CO emitting layer height as a function of radius (solid black line), and the related uncertainty (black ribbons), compared to the 2D temperature structure in the background (Law et al. 2024). The two solid green and blue lines refer to the ¹²CO and ¹³CO emission surfaces, with related uncertainties, respectively (Law et al. 2024). The dashed red line refers to the NIR scale height as a function of radius, from Keppler et al. (2018), while the red diamond is the height of the NIR emitting layer at the NIR ring ~$0_{\cdot }^{\mathrm{\prime }\mathrm{\prime }}48$ (Law et al. 2024). Dashed black lines indicate fixed z/r layers.