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Published online by Cambridge University Press: 12 April 2016
The cosmological evolution of stellar populations can be studied by observing, e.g,, high-z radio galaxies, and comparing their SEDs to those of local objects. But in such objects, the nuclear activity strongly influences the optical properties; to disentangle the superposition of spatial and spectral effects, complete 3-D data cubes are needed, such as those that can be obtained with the pioneering 3-D instrument TIGER.