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. 2006 Feb 13;361(1469):791–810. doi: 10.1098/rstb.2005.1782

Figure 11.

Figure 11

The first (F1) and second (F2) formant frequencies for the plosives /b/, /d/, /g/, and the burst of noise produced when the sound is released after the vocal tract has been closed. VOT, voice onset time, one of the cues for voicing.