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Figure 3

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One-third octave representation of the obtained reverberation times T20 by using a noise and impulse source including their standard deviation. The T20 values are shown here because the signal-to-noise ratio was too small, so that a 60 dB drop in the sound pressure level was not observed (the T20 values were determined when the decay curve first reaches the values 5 dB and 25 dB below the initial level and then extrapolated to a 60 dB decay to approximate the T60 values).

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