Number of radio continuum sources detected in the K-band images (marked in blue and corresponding to 15 sources) and in the C-band images (marked in green and corresponding to 142 sources). Only 4 of the 146 detections are detected in the K-band images alone. The vast majority (131) are detected only in the C-band images (see Sect. 3.1 for more details). The bottom labels mark the sources that are located within the primary beams of the K-band and C-band images. Thirty-eight sources are located outside the C-band primary beam (oC), 68 sources are located inside the C-band primary beam but outside the K-band primary beam (iC/oK), and 40 sources are located within the primary beam of both images (iC/iK). See Sects. 3.1 and 3.2 for more details.