This PDF file includes:

• Supplementary Text
  
• fig. S1. Age models of stalagmites.
  
• fig. S2. New Sahiya δ¹⁸O records between 5700 and 2000 yr BP.
  
• fig. S3. Comparision of the Sahiya δ¹⁸O record with the Mawmluh δ¹⁸O record.
  
• fig. S4. Comparison of the Sahiya δ¹⁸O record with instrumental precipitation records in the cave area.
  
• fig. S5. Comparison of the Sahiya δ¹⁸O record with the proxy NH temperature reconstruction.

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Other Supplementary Material for this manuscript includes the following:

• table S2 (Microsoft Excel format). The composite Sahiya Cave oxygen isotope record.
  
• table S2 (Microsoft Excel format). ²³⁰Th dating results.