Radial surface brightness profile of the star BD+33D2642 as measured in a PMAS datacube. Small grey dots show the flux in individual pixels, the black squares were obtained by radially binning the data. We used a Moffat profile and a simple Gaussian profile as the analytical PSF description and fitted the star with both PSF models. The blue solid line shows the best-fit PSF when using the Moffat, the green dashed line shows the best-fit PSF for the Gaussian profile.