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Data S1. Chronology of the Lake Katinda record.

Data S2. Age-depth modeling and correction for the compaction gradient in Lake Katinda.

Data S3. Estimation of confidence intervals for the Katinda charcoal influx.

Data S4. Chronology of the Lake Naivasha record, and charcoal influx estimation.

Data S5. Multivariate and wavelet analyses.

Data S6. Charcoal morphology analysis for Lake Katinda.

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