Columns 1, 2, 4, and 5: radio spectral index (600–300 MHz, weighted by 300 MHz intensity with I _max based on the bottom right frame, simulation P95A45) with 300 MHz radio brightness contours (levels = [1, 10, 100] μJy beam⁻¹). Column 3, which varied least in spectral index (∼0.6 in the jets, ∼0.75 in the lobes), shows instead the radio brightness at 300 MHz. The radio images are convolved to 2.355″ FWHM resolution. Each row shows simulations with different precession angles (row 1: 10°, 2: 20°, 3: 30°, and 4: 45°). The columns show simulations with differing precession periods, or the same simulations at different times (period for column 1 and 2: 3.2 Myr, 3 and 4: 31.7 Myr, and 5: 95.1 Myr; columns 1, 3, and 5 are shown at approximately one precession period; and columns 2, 4, and 5 are shown at 96 Myr simulation time).