Upper panel: LOFAR Image of Arp 299-A at 150 MHz with a beam of 0.44 × 0.41 arcsec² (Position Angle = − 51.88^∘) and a sensitivity of rms = 90 μJy beam⁻¹. Lower panel: zoomed image of the region of ≈1.2 × 1.6 kpc marked with a green box in the upper panel. The absorbed regions of the southern part of the outflow are indicated with green boxes. The sizes are approximately 330 pc × 380 pc (left) and 420 pc × 500 pc (right).