Summary of procedure followed to estimate the Hα flux within the radius aperture, for a typical case of a galaxy with a rotation curve. Top-left panel: velocity map from KUBEVIZ. The star at the centre of the image reprensents the pixel position from which the aperture is estimated. Bottom-left panel: distance matrix that defines the six-pixel radius corresponding to the aperture. Top-right panel: shows which spaxels from the original map are discarded because they fall outside the aperture. Bottom-right panel: corrected velocity field obtained following the procedure described in the main text for assigning a peculiar velocity to the spaxels flagged as bad in KUBEVIZ.