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Fig. 6


H2CO 303–202 and C18O 2–1 data are compared with best-fit normalized models for each scenario mentioned in Sect. 3.2. The low-temperature model (dot-dashed cyan), power-law model (dotted blue), temperature step-abundance model (dashed red), and radial step abundance model (solid gold) show the radial distribution and spectra. Left: radial intensity curves of the best-fit normalized models obtained from azimuthally-averaged elliptical annuli projected to i = 44°, PA = 133°. The shaded grey region represents 1σ error bars. H2CO profiles are taken from integrated intensity maps after applying a Keplerian mask. Right: disk-integrated spectra of the best-fit normalized models obtained from a 5.6 circular aperture. H2CO spectra are Hanning smoothed to 0.336 km s-1 channels. Parameters for each model can be found in Table 2.

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