Nuclear spectra of NVSS J021308-322338 (left) and TN J1123-2154 (right) extracted using a circular synthetic aperture with a radius of 1$\genfrac{}{}{0ex}{}{″}{·}$2 located at the center of their radio emission. The vertical dashed red lines mark the wavelength of the reported Lyα  detection. No line emission is visible in these spectra. The inset on the top right corresponds to a narrowband image extracted with a width corresponding to 1,000  km s⁻¹.