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Contrary to what is asserted in a recent paper by Kostadt and Liu ("Causalityand stability of the relativistic diffusion equation"), experiments can tellapart (and in fact do) hyperbolic theories from parabolic theories ofdissipation. It is stressed that the existence of a non--negligible relaxationtime does not imply for the system to be out of the hydrodynamic regime.Comment: 8 pages Latex, to appear in Phys.Rev.

Why hyperbolic theories of dissipation cannot be ignored: Comment on a paper by Kostädt and Liu