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. 2020 Nov 20;10:20263. doi: 10.1038/s41598-020-76924-3

Figure 3.

Figure 3

Chronology of the opium poppy in western Europe. The dates were calibrated with OxCal 4.4. software based on the IntCal20 atmospheric curve59,60. The asterisk corresponds to the dating performed directly on the opium poppy.