Comparison of the size of the FIR emission with the sizes of the Hα (red) and [O III] (blue) emission. The effective radii of the FIR emission are measured from the best fit on the visibilities. The Hα and [O III] sizes are measured by fitting a 2D Gaussian to the images. If the measured size is smaller than the beam, we show the point as an upper limit. The two objects with low S/N (< 8) in the ALMA data are not shown (cid_1057 and cid_451). The FIR and Hα sizes of the sample of z ∼ 2 AGN from Scholtz et al. (2020) and from Chen et al. (2020) are shown with violet circles and magenta diamonds, respectively. The white diamonds are non-AGN from Chen et al. (2020). On average, the FIR sizes are smaller than the Hα and [O III] sizes by a factor of ∼2.