Contour plots of Arp 299-A (a), Arp 299-B nuclei (b), and (c) C and (d) C′ compact components. The red and blue contours represent the local brightest values at 150 MHz and 8.4 GHz, respectively.The grey contours in a and b show the values that shape the structures present in the two nuclei (the starburst driven outflow for A-nucleus and the assumed bowshock for B-nucleus) and detected at 150 MHz by LOFAR (see Ramírez-Olivencia et al. 2018, for A-nucleus). The black crosses give the location of the maximum for each frequency. The arrows represent the directions of the shift (black) and the structure (grey).