Mg ii λλ2796, 2803 absorption profiles of halo gas around the super-L_* barred spiral galaxy G2 at z = 0.7818. Absorption spectra of QSO sightlines A^′, C ^′ and D^′ (corrected lensed image positions at the redshift plane of G2; see the image in Fig. 7) obtained with MagE are available. Zero relative velocity corresponds to the systemic redshift of the galaxy at z = 0.7818. Despite a lower spectral resolution, the MagE spectra show remarkably distinct absorption morphology across different sightlines. In particular, sightlines C ^′ and D^′ occur at a similar projected distance from G2 and are roughly 6 kpc in projected separation. The observed Mg ii absorption is spread over 130 km s⁻¹ along the sightline towards C ^′, whereas more concentrated absorption is found within a narrow FWHM ≈ 42 km s⁻¹ along the sightline towards D^′.