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H. Kirsi and S. Scientist, PhD student VTT Technical Research Centre of Finland P.O.Box 1000, FI-02044 VTT, Finland Kirsi, Hyytinen@vtt.fi Sampsa, Ruutu, Research Scientist

N. Mika, Principal Scientist VTT Technical Research Centre of Finland P.O.Box 1300, FI-33101Tampere, Finland Mika