Fig. A.1.

Postage-stamps (10 × 10 arcsec), centered on the position of the ALMA detection at different wavelengths. From left to right: HST-WFC3 (F814W, F160W), ZFOURGE (Ks), Spitzer-IRAC channel 1 (3.6 μm), Spitzer-MIPS (24 μm), ALMA band 6 (1.1 mm), VLA (5 and 10 cm). Blank images mean that the source is out of the field of view of the instrument. The white cross indicates the position of the ALMA detection. The north is up and the east is left.
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