Footprints of ALMA observations toward the MUDF. Left panel: The background shows the HST/WFC3 F140W image, and the gray lines show the PB response of the ALMA band 6 mosaic at 30% and 50% (solid and dashed lines, respectively). The orange line indicates the region observed by VLT/MUSE with >3 hours of exposure time. Red diamonds indicate the MUDF quasar pair. The blue squares with labels indicate the high-fidelity ALMA-selected sources extracted from the 1.2 mm continuum image. The dot-dashed black circles show the ALMA pointings of the band 3 spectral scans toward three individual sources (P.C1, P.C3, and P.C4). The diameter of the circles indicates the HPBW at 101 GHz. Right panel: ALMA band 6 continuum observations. The synthesized beam size is shown in the bottom right corner.