Left: LOFAR HBA greyscale image of VLSS J1431.8+1331. Overlaid contours (in red): [−6,20,40,90,150] × σ, σ = 0.5 mJy beam^-1. Right: measurement regions (outlined in magenta) used in the spectral (ageing) analysis. VLA 1425 MHz high resolution contours (van Weeren et al. 2011) are shown in white, outlining a core inside Region 4. Contour levels: [− 3,3,9,12,20] × 4 × 10^-2 mJy beam^-1. The beam sizes are indicated in the lower left corner.