Top panel: spectral index comparison between the truth (left), MS–MFS with gain=0.1 (middle), and WAsp with gain=0.4 (right) on the jet dataset, illustrating the wide-band imaging test of scale-sensitive modeling and spectral index reconstruction accuracy across mixed compact and extended structures. Bottom panel: residual image comparison of the first three Taylor terms between the MS–MFS (top) and WAsp (bottom) on the jet dataset, demonstrating the improved wide-band spectral modeling and more noiselike residual structure achieved by WAsp. All images in each panel are displayed at a common scale shown in the color bar on the right of each panel.