Continuum images of Mrk 273. Images in the first and second row show the large-scale structure at (a) 54 MHz with LOFAR LBA, (b) 1360 MHz with Apertif, (c) 1455 MHz with VLA and (d) 4700 MHz with VLA. The third and fourth row show small-scale structure in the nuclear region with (e) LOFAR at 144 MHz, VLA at (f) 4700 MHz and (g) 8415 MHz. The contour levels in all images are 3 where n = 0,1,2...10. σ_rms is 1.5 mJy beam⁻¹, 35 μJy beam⁻¹, 60 μJy beam⁻¹ and 30 μJy beam⁻¹ for the LOFAR 54 MHz (a), Apertif 1360 MHz (b), VLA 1455 MHz (c) and VLA 4700 MHz (d) image, respectively. For the high resolution images, σ_rms is 78 μJy beam⁻¹, 30 μJy beam⁻¹ and 28 μJy beam⁻¹ for the (e) LOFAR 144 MHz, (f) VLA 4700 MHz and (g) VLA 8415 MHz image, respectively. The LOFAR 144 MHz sub-arcsecond image has a lower resolution of 0.4″×0.5″, than the one in Fig. 2. The negative contours are marked by dashed lines and are at −3σ_rms level. Image statistics are summarised in Table 1.