Comparison of the S/N optimization method with other techniques using the VLT-VIMOS observation of IRAS F10409-4556. Top-panels: Hα narrow-band (left) and V-band continuum (right) images showing the morphology of the galaxy. Middle-left panel: selected spaxels using a simple S/N threshold cut ( > 2) to the continuum at 5700 Å (100 Å width). Middle-right panel: selected spaxels applying the S/N optimization method in the continuum using the same parameters as in the S/N threshold case. Bottom-panels: Voronoi binning of the selected spaxels using the S/N threshold technique (left) and the S/N optimization (right), with a target minimum S/N within each bin of 5.