Comparison between the WISE 22 μm PSF and aperture photometry for the entire CALIFA mother sample (white points) and for the galaxies used in this work (black points). Solid line corresponds to the 1:1 line and is given for reference. Although the WISE Source Catalog is ideal for point sources and the resolution of the WISE 22 μm band is wide enough (FWHM ~ 11 arcsec) it does not seems to be suitable for the CALIFA sample.