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Figure 1: Unweighted source spectra of wind turbines: average of 37 turbines according to Søndergaard et al.,[2] a Vestas V80 according to Rogers et al.,[3] and a Vestas V52/850 measured by the authors in 2009. Typical spectra for road and aircraft noise are drawn as a reference, normalized at 100 dB SPL

Figure 1: Unweighted source spectra of wind turbines: average of 37 turbines according to Søndergaard <i>et al</i>.,<sup>[2]</sup> a Vestas V80 according to Rogers <i>et al</i>.,<sup>[3]</sup> and a Vestas V52/850 measured by the authors in 2009. Typical spectra for road and aircraft noise are drawn as a reference, normalized at 100 dB SPL