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Available δ13C and δ15N values (n = 34) plotted against main periods at TT and DK. Black symbols indicate specimens analysed specifically for C and N isotopes from Tabula Traiana only (n = 13, Table 7); green symbols indicate stable isotope values from AMS burns (n = 21, Table 6) that lack the three‐point calibration standard and are only indicative values. [Color figure can be viewed at wileyonlinelibrary.com]
