GCMS Acid extraction (AE) data files This data set is comprised of data files produced by Gas Chromatography-Mass Spectrometry (GC-MS) of lipids extracted using acid extraction method from Neolithic pottery vessels from the site of Sławęcinek, Poland These data are linked to the published journal where methods of extraction, the context of pottery and the interpretation of data are fully described. The file names correspond to the sample code related to individual sherds as shown in supplementary information of this study. The acquisition method for all files is given in TEXT format. The files are presented in cdf. format, which can be converted to ms. or d. files for analysis on software such as Agilent ChemStation or Mass Hunter.