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Figure 7: Octave-band analysis: Comparison of measurements (a) for different road types, (b) for rear and front windows open, (c) for front window open, and (d) for rear window open

Figure 7: Octave-band analysis: Comparison of measurements (a) for different road types, (b) for rear and front windows open, (c) for front window open, and (d) for rear window open