Spectral origin of non-Markovian open-system dynamics: A finite harmonic model without approximations

Financial support from MICINN, MINECO, CSIC, EU commission, FEDER funding under Grants No. FIS2007-60327 (FISICOS) and No. FIS2011-23526 (TIQS), postdoctoral JAE program (ESF), and COST Action MP1209 is acknowledged.

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