Fig. 2 Relationship between SR and ID across languages

Colors represent the language families, and individual languages are identified by the labels on top (to avoid overlapping labels, short black lines might show their actual position). While there is only one value of ID per language, there are as many values of SR per language as texts read by individual speakers. The straight yellow line represents the linear regression [with 95% confidence interval (CI)], and the black curve represents the locally estimated scatterplot smoothing regression (with 95% CI) of SR on ID.

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