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A Collaborative Epidemiological Investigation into the Criminal Fake Artesunate Trade in South East Asia

Figure 3

Plot of δ13C and δ18O Values, in ‰, of Carbonate in Tablets

Also plotted are approximate fields for values expected from calcite in different geological environments; igneous (red), metamorphosed (pink), and unaltered limestone (green). Sample 05/17 is represented by the top right data point.

Figure 3

doi: https://doi.org/10.1371/journal.pmed.0050032.g003