Left panel: CFHT/VESTIGE Hα image of NGC4330 smoothed at ~2.5′′ resolution. The red contour is at 3 × 10⁻¹⁸ erg cm⁻² s⁻¹ arcsec⁻². Right panel: CFHT/VESTIGE r-band image of NGC4330. In both panels we highlight the position and the extension of the VLT/FORS2 long slit in red, and the regions in which we performed the aperture photometry in blue. In the right panel we also show their ID, as defined in the text. The photometric regions have a width along the minor axis of 5′′ in the inner part of the galaxy in order to minimise the mismatch with the spectrum due to differential stellar populations or dust extinction. Going towards the outskirts of the galactic disc we increase the width to 10′′, and 15′′ to preserve the signal-to-noise ratio with decreasing stellar surface brightness.