Left panel: CFHT/VESTIGE Hα image of NGC4330 smoothed at ~2.5′′ resolution. The colour cuts are selected to highlight the low surface brightness features. The red contour is at 3 × 10⁻¹⁸ erg cm⁻² s⁻¹ arcsec⁻². The blue contours are from HI observations obtained with the Very Large Array in C+D configuration, with a beam size (shown in the lower left corner) of ~ 2 kpc (Chung et al. 2009). The contour levels are at Σ(HI) = 2, 16, 128, 256 × 10¹⁹ cm⁻². Right panel: GALEX FUV image of NGC4330 with Hα contours at 3,  15,  125  × 10⁻¹⁸ erg cm⁻² s⁻¹ arcsec⁻². The Hα disc is truncated to a smaller radius compared to the FUV emission, while the Hα extraplanar emission is more extended to the S.