Spectral index maps of 4C 70.19. Left: Map between 145 MHz (LOFAR) and 8350 MHz (Effelsberg) overlaid with contours of the former map. The contour levels are (3, 10, 30, 100, 250, 300, 350, 400, 450, and 500) × 1.8 mJy beam⁻¹. The beam size of 82″ is presented in the upper left corner of the image. Right: Map between 145 MHz (LOFAR) and 4850 MHz (VLA+Effelsberg) overlaid with contours of the LOFAR map convolved to the resolution of the latter map. The contour levels are (3, 8, 16, 32, 64, 80, 96, 128, and 256) × 0.32 mJy beam⁻¹. The beam size of 15″ is presented in the upper left corner of the image.