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. 2014 Sep 25;9(9):e107982. doi: 10.1371/journal.pone.0107982

Figure 5. Relative frequency of dated monuments with ch’ahb’ bloodletting glyph in each 20-year k’atun period.

Figure 5

References to bloodletting rituals exceed 15% during two k’atun periods, 9.8.0.0.0 (593–613 CE) and 9.13.0.0.0 (692–712 CE).