Colour image of RO-0959 and RO-0959-Sat from F444W, F277W and F115W bands of JWST NIRCam. The cyan box shows the 1.1′×1.1′ FOV of the MUSE mosaic. The orange circles show the virial radii of the two halos with the errors illustrated by the pink segment on each circle, being 139 ± 32 kpc for both RO-0959-Sat and RO-0959. The contours show the Lyα SB distributions in both nebulae displayed in steps of log$({\mathrm{SB}}_{\mathrm{Ly}\alpha }/{\mathrm{erg}\mathrm{s}}^{-1}{\mathrm{cm}}^{-2}{\mathrm{arcsec}}^{-2})$ = (−18.5, −18.0, −17.5, −17.0). The lowest contour level corresponds to S/N = 3. The central and the second candidate member galaxies in Table 2b with log(M_*/M_⊙)≃11.2 and 9.9 are highlighted by the pink and green circles.