Observed SEDs of AT 2019azh at epochs before 40 d, compared to the grid of simulated escaping spectra. The models have a wavelength grid such that the wavelength changes by 2% at each step, and are smoothed with a median filter of size 3. The top, middle, and bottom panels show models with 50°, 60°, and 70° inclinations, respectively. The colouring denotes the value of L_inj as described in the legend, while the solid, dashed, and dotted lines represent models with a density profile scaling factor of 2, 1.5 and 1, respectively. We additionally show the X-ray spectrum observed at 20 d (Guolo et al. 2024) with black circles.