Central emission of Fornax A seen at 1.44 GHz by MeerKAT (top left panel), at 4.86 GHz (top right panel), 14.9 GHz (bottom left panel) by the VLA and at 108 GHz (bottom right panel) by ALMA. The PSF of the images is shown in white in the bottom left corner. Contour levels start at 0.6 mJy beam⁻¹, increasing by factors of three. In the top left panel, the black dots show where we measured the variations in flux density and width along the jets (see Sect. 4 for further details).