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. 2013 Nov 8;8(11):e78273. doi: 10.1371/journal.pone.0078273

Figure 5. Intonation of the OIR interjection by language.

Figure 5

Intonation of the OIR interjection is rising in most languages and falling in some, but more accurately described as “questioning” in all. In this product plot [102], area of squares is proportional to token count: a larger square means more tokens.