Cutout images of HLock01-LAB: SHARDS medium-band U534/17 (λ_cent ≃ 5300 Å, FWHM ≃ 177 Å) and U551/17 (λ_cent ≃ 5500 Å, FWHM ≃ 138 Å; upper and bottom left, respectively), continuum-subtracted Lyα emission smoothed with a Gaussian kernel (U534/17-U551/17, upper right), and HST WFC3 F110W (bottom right). The size of the images is 20″ × 20″ centered on the Lyα nebula. Red and blue contours indicate the radio VLA 1.4 GHz (3 and 4σ levels) and the 3σ Lyα emission (5 and 10σ levels are also shown in white in the smoothed Lyα image), respectively. The Lyα emission shows an elongated morphology aligned with the radio sources contained within the central ≃8 kpc of the nebula. In all panels north is up and east is to the left.