246.2 GHz continuum maps of some of the sample sources with a large field of view to show the detection of the sources located outside the primary beam. Contour levels start at 5σ except for CSO33, FIR2 and CSO3 for which contour levels start at 3σ. Level steps are 5σ for FIR6c, FIR2, MMS9, MMS2 and CSO3, 7σ for CSO33 and FIR1a and 10σ for MMS5. The primary beam is indicated by the dashed circles and the beam size is represented at the bottom left of the plots. These maps are not corrected for the primary beam.