PSZ1G139.61+24. Top left panel: high-resolution 144 MHz LOFAR image of PSZ1G139.61+24. The contour levels start at 3σ, where σ = 150 μJy beam⁻¹, and are spaced by a factor of two. The negative contour level at −3σ is overlaid with a dashed line. The beam is 11′′ × 8′′ and is shown in grey in the bottom left corner of the image. Top right panel: low-resolution 144 MHz LOFAR image of PSZ1G139.61+24. The contour levels start at 3σ, where σ = 500 μJy beam⁻¹, and are spaced by a factor of two. The negative contour level at −3σ is overlaid with a dashed line. The beam is 35′′ × 35′′ and is shown in grey in the bottom left corner of the image. Bottom left panel: optical Pan-STARRS image of PSZ1G139.61+24 with the high-resolution (11′′ × 8′′) 144 MHz LOFAR contours overlaid. Bottom right panel: Chandra X-ray image of PSZ1G139.61+24 smoothed on a scale of 6′′ with the low-resolution (35′′ × 35′′) 144 MHz LOFAR contours overlaid. The red arc indicates the position of the cold front found by Savini et al. (2018a).