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. 2023 May 3;15(5):70. doi: 10.1007/s12520-023-01771-y

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© The Author(s) 2023

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 6 — Top — scatter plot of results from the 25 samples analysed by GC-C-IRMS, showing C_16:0 ẟ¹³C from the C_18:0 ẟ¹³C. Bottom — plot of Δ¹³C against ẟ¹³C_16:0 for the 25 ceramic samples from Isla de Mona selected for GC-C-IRMS analysis. Indigenous samples = diamonds. European samples = squares. Lipid profiles represented by colour: Lipid Profile 1 = green, Lipid Profile 2 = yellow, Lipid Profile 3 = blue, Lipid Profile 4 = red. Six samples with SRR/RRR ratio over 75.5%, a possible indication of the presence of aquatic oils, are circled