Supplementary Material for Larsson (2025) From the ashes: a 150th anniversary review of the Askja-1875 tephra doi-10-17045-sthlmuni-29098307-0 https://doi.org/10.17045/STHLMUNI.29098307 Swedish National Data Service Svensk nationell datatjänst Landing page Supplementary Material for Larsson (2025) From the ashes: a 150th anniversary review of the Askja-1875 tephra doi-10-17045-sthlmuni-29098307-0 https://doi.org/10.17045/STHLMUNI.29098307 Larsson, Simon Swedish National Data Service Svensk nationell datatjänst Landing page 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 (https://doi.org/10.58051/ns01-jf70). 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): Table S1. Compilation of published raw (non-normalised) data from geochemical analyses of glass from the Askja-1875 tephra in the form of major-element oxide compositions provided as weight percentages. Table S2. Normalised data of published Askja-1875 tephra-derived glass-shard major-element oxide compositions. Table S3. Centred log-ratio transformed selection of data of published Askja-1875 tephra-derived glass-shard major-element oxide compositions. Table S4. Results of principal component analysis performed on centred log-ratio transformed selection of data of published Askja-1875 tephra-derived glass-shard major-element oxide compositions. R code. Script used for data treatment and statistical analysis. References. List of references for the articles presenting the published raw data compiled in Table S1. Access to data through an external actor. Åtkomst till data via extern aktör.