Supplementary Material for Larsson (2025) From the ashes: a 150th anniversary review of the Askja-1875 tephra

Supplementary material to the article "From the ashes: a 150th anniversary review of the Askja-1875 tephra" by S.A. Larsson, published in Dynamica through Stockholm University in 2025 (<b>ADD DOI HERE, IN THE EXCEL FILE, AND IN "ASSOCIATED PUBLICATION" SECTION AFTER PUBLICATION</b>). The material is published as a .xlsx spreadsheet file containing the following contents, divided onto separate sheets (also made available as separate .csv and .txt files):<b>Table S1.</b> Compilation of published raw data from geochemical analyses of the Askja-1875 tephra in the form of major-element oxide compositions provided as weight percentages.<b>Table S2.</b> Normalised data of published Askja-1875 tephra major-element oxide compositions.<b>Table S3.</b> Centred log-ratio transformed selection of data of published Askja-1875 tephra major-element oxide compositions.<b>Table S4.</b> Results of principal component analysis performed on centred log-ratio transformed selection of data of published Askja-1875 tephra major-element oxide compositions.<b>R code.</b> Script used for data treatment and statistical analysis.<b>References.</b> List of references for the articles presenting the published raw data compiled in Table S1.<br>