Cutouts of the central parts of the stacked 6 cm images towards the east and west nuclei of Arp 220, with off-source rms noise σ = 4 μJy beam⁻¹. The two panels are displayed using the same arcsinh grey-scale from −20 μJy beam⁻¹ (−5σ) to 1140 μJy beam⁻¹ (the maximum brightness value). The full 0.8192″ × 0.8192″ images of both nuclei were used for the source finding, as described in Sect. 2.1. The positions of the sources studied in this work is shown in Fig. 3