Near-infrared J-band images of the nine sources from Fig. 1. Contours show the SMA morphology at 850 μm. The FWHM beam size of all SMA data is about 2′′ (the FWHM beam size is shown in the bottom left corner of each panel), except for PLCK_G080.2+49.8, where it is 0.8′′.
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