Visual example of the S/N optimization method applied to the VLT-VIMOS observation of the LIRG IRAS F06295–1735. Top-left panel: Hα “narrow-band” image showing the morphology of the barred spiral galaxy. The colour intensity of each spaxel is scaled to the total flux intensity for that particular region, which includes Hα + [NII] line-emission and continuum. Top-right: selected spaxels using the S/N optimization continuum criterion. Bottom-left: selected spaxels after applying a S/N optimization to the Hα emission-line. Bottom-right: continuum S/N selection after discarding the nuclear spaxels in a circular aperture of 2 kpc.