Spectral index distribution maps of 0954+556. From left to right, the panels show the distribution of spectral index between 1.4 and 5 GHz at kpc scales, between 5 and 8.4 GHz at kpc scales, between 1.7 and 5 GHz at pc scales, and between 5 and 8.4 GHz at pc scales. The overlapped contour images are a VLA image at 1.4 GHz with a uv range 5.1 − 168.7 Kλ, a VLA image at 5 GHz with a uv range 11.3 − 561.2 Kλ, a VLBA image at 1.7 GHz with a uv range 2.3 − 48.0 Mλ, and a VLBA image at 5 GHz with a uv range 5.4 − 39.5 Mλ, respectively. All counters start at 3σ_rms and increase by a factor of 2. The color represents the value of spectral index α. Pixels with flux density below 5.4σ_rms, alongside those with spectral index uncertainty exceeding 40%, are blanked.