Changes regarding dispersive media and metamaterials in version 6.0 rev.4 FTP1:
Two corrections in Drude and Lorentz magnetic dispersion have been made: in plasma frequency scaling, in setting dispersive parameters for the Hz component.
For Debye model, tau <= 0 causes that dispersive relations are not applied. The medium is analysed as a non-dispersive one, with permittivity eps_s and conductivity Sigma.