Archival ALMA observations in the COSMOS field used in this study. Individual pointings are plotted with different colors representing the observed ALMA bands. In the background, the COSMOS field is shown in gray. We show three zoom-in regions representative of possible classes of pointing configurations. Panel a: three overlapping pointings in the same band. Panel b: three concentric pointings in different bands. Panel c: overlapping and concentric pointings in different bands.