Spectral index maps of 3C 219 presented as color maps, with color bars representing the scales given next to each panel. Top left: Spectral index map of the whole radio galaxy. A convolved 4.89 GHz contour map is overlaid for reference. The contour levels are (3, 39, 267, 600, 1830)×0.17 mJy/b.a.. The size of the circular beams for the color and contour maps is 20″. Top right: Spectral index map of the inner double with diffuse relic emission removed. The convolved 4.85 GHz contour map was overlaid for reference. The contour levels are (3,24,63) × 0.17 : mJy/b.a. The size of the circular beams for the color and contour maps is 2.7″. Bottom left: Spectral index 1σ error map of the whole radio galaxy. The contour map is the same as in the top-left panel. Bottom right: Spectral index 1σ error map of the inner double. The contour map is the same as in the top-right panel.