Left panel: V band image of NGC 7321, an example of a CALIFA galaxy with a star in the FoV to measure the PSF of the data. Right panel: distribution of the FWHM of the CALIFA PSF as measured from 34 cubes with a sufficiently bright star in the field. The median of the distribution is 37; the spread of values is due to the flux of the underlying galaxy structure and undersampling of the stellar image and hence high-value outliers are upper limits in these cases.