Fig. 4
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Thresholds defining the CTT classification following White & Basri green dashed line (2003) and Barrado y Navascués & Martín orange dash-dotted line (2003). Blue symbols represent our sample; grey symbols are data from Fernandes et al. (2015). These criteria were used to classify the CTTs (indicated by circles), WTTs (triangles), and possible WTTs (crosses).
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