Radial intensity and spectra of observed H2CO 303–202 and C18O 2–1 versus the best-fit models. Left: radial intensity curves from azimuthally-averaged elliptical annuli projected to i = 44°, PA = 133°. HD 163296 data is show in black, best-fits for H2CO and C18O are in gold. The vertical dashed lines indicate the CO snow line (blue dash) from Qi et al. (2015), the 5σ outer radius of the 1.3 mm grains (black dash), and the change-over radii, Rc, for the best-fit radial step-abundance models (gold dash). H2CO profiles are taken from integrated intensity maps after applying a Keplerian mask. Right: disk-integrated spectra. HD 163296 data is shown in filled gray. H2CO spectra are Hanning smoothed to 0.336 km s-1 channels.
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