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

<p dir="ltr">Supplementary material to the article "From the ashes: a 150th anniversary review of the Askja-1875 tephra" by S.A. Larsson, published in <i>Dynamica </i>through Stockholm University in 2025 (<a href="https://doi.org/10.58051/ns01-jf70" rel="noopener noreferrer" target="_blank">https://doi.org/10.58051/ns01-jf70</a>). 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):</p><p dir="ltr"><b>Table S1.</b> 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.</p><p dir="ltr"><b>Table S2.</b> Normalised data of published Askja-1875 tephra-derived glass-shard major-element oxide compositions.</p><p dir="ltr"><b>Table S3.</b> Centred log-ratio transformed selection of data of published Askja-1875 tephra-derived glass-shard major-element oxide compositions.</p><p dir="ltr"><b>Table S4.</b> 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.</p><p dir="ltr"><b>R code.</b> Script used for data treatment and statistical analysis.</p><p dir="ltr"><b>References.</b> List of references for the articles presenting the published raw data compiled in Table S1.</p><p><br></p>