Typical field-of-view of a MASSIV source. We show the flux of the source 220397579 in the five channels of its reduced, flux calibrated, data cube centred on the position of the Hα emission line (scale in the right). The pixel spatial scale is 0.125″, that at the redshift of the source (z = 1.0379) corresponds to  ~1 kpc. The source is at the centre of the image (black cross), while the white circle delimits the 20   h^-1 kpc area around the source. In this particular case, 99% of this area is covered with MASSIV data and the two negatives of the source (black regions) are also excluded.