n-alkane peak areas from GC-FID measurements. Compound specific hydrogen and carbon isotope measurements made using GC-IRMS. Samples taken from Auel Maar, Holzmaar, and Schalkenmehrener maar lake sediment cores spanning 60,000 years. Age model information and additional proxy data from the ELSA-20 stack are found in Sirocko et al., 2021 (Nature Geoscience) and Sirocko et al., 2022 (Scientific Reports). Full methodological details are found in Zander et al., 2025 (Rapid Communications in Mass Spectrometry).