Radio color-color plots of the simulated relic from Wittor et al. (2019) at different viewing angles, superimposed with the JP (blue) and KGJP (magenta) spectral aging models obtained assuming α_inj = −0.70. Top panel: face-on view of the relic, the middle panel at 45° viewing angle, and the bottom panel the edge-on view. The spectral indices are measured inside the ∼(15.8 kpc)² boxes, as shown in the insets. The colors of the boxes match the colors of the points in the color-color plot; a red square is above the power-law line and a green square is below the power-law line. The plots reflect the differences in the spectral shapes of relics depending on the viewing angle.