Entity CWC-1s, CWC-2ss and CWC-3l (entity_id = 405, 406, 407): d18O data originally provided relative to SMOW. Converted to PDB to match d13C data using equation from Allan and Wiggins (1993) (DOI: doi.org/10.1306/CE36576). Analytical precision for isotope data is better than 0.05 permil.