NOEMA CLEANed images of APM 08279+5255 and NCv1.143, made from the visibilities obtained by averaging all the USB channels from the highest-frequency tunings (w18eb003 and s18dc003; Table 1). These tunings were chosen since they are expected to offer the highest spatial resolution among all the spectral windows in our tunings. The contour levels begin at 5σ and increase in increments of 10σ. The unit of the color bar and contours is arbitrary, with values representing fluxes integrated over the entire USB of the tuning. The primary objective here is to illustrate that the sources are unresolved rather than provide precise flux measurements. The offset for APM 08279+5255 is explained in Sect. 3.