Example for the recovery of the PSF in a datacube. Shown is the accuracy of the recovered PSF parameters β (top) and FWHM (bottom) in comparison to their true values (blue dashed line). The grey solid line gives the best-fit values of the PSF parameters obtained in each layer and the final parameters of the PSF model obtained from these values are shown as a solid green line. The analysis was started at the central image of the datacube and proceeded simultaneously to the red and blue ends of the cube.