Spectral index maps of AS1063 between 325 MHz and 1.5 GHz (left), and between 1.5 GHz and 3.0 GHz (right). The radio contours are from the 325 MHz (left) and 1.5 GHz (right) images. These maps were created from the compact source subtracted uv-data. The beam size is indicated in the bottom left corner. Contour levels are drawn at [1, 2, 4, 8, ...] × 3σ_rms, where σ_325 MHz = 96 μJy beam⁻¹, σ_1.5 GHz = 40 μJy beam⁻¹.