First to last row: 54, 144, 400 MHz and 1.4 GHz, low- (left column) and high-resolution (right column) images of A1550, produced by tapering visibilities at 30″ and applying Briggs −0.6, respectively. The yellow circle denotes R₅₀₀ = 1173 kpc (Botteon et al. 2022). Row A, left panel: 54 MHz low-resolution image. The beam is 38″ × 25″, with rms noise σ ∼ 1.6 mJy beam⁻¹. Contours are at [−3, 3, 6, 12, 24]×σ. Row A, right panel: 54 MHz high-resolution image. The beam is 18″ × 11″, with rms noise σ ∼ 1.5 mJy beam⁻¹. Row B, left panel: 144 MHz low-resolution image. The beam is 35″ × 32″, with rms noise σ ∼ 0.14 mJy beam⁻¹. Row B, right panel: 144 MHz high-resolution image. The beam is 8″ × 4″, with rms noise σ ∼ 69 μJy beam⁻¹. Row C, left panel: 400 MHz low-resolution image. The beam is 38″ ×26″, with rms noise σ ∼ 0.28 mJy beam⁻¹. Row C, right panel: 400 MHz high-resolution image. The beam is 6″ × 3″, with rms noise σ ∼ 60 μJy beam⁻¹. Row D, left panel: 1.4 GHz low-resolution image. The beam is 32″×32″, with rms noise σ ∼ 26 μJy beam⁻¹. Row D, right panel: 1.4 GHz high-resolution image. The beam is 13″ × 12″, with rms noise σ ∼ 18 μJy beam⁻¹.