Additional supporting information can be found in the online version of this article:

jqs2663-sm-0001-SuppTab-S1.xls240KTable S1. Excel spreadsheet with major element data for each of the tephra layers analysed (each in a separate sheet), together with the date of analysis and beam size. Analyses of the reference standard glasses BCR2G and Lipari are given in the Standard data sheet. A summary geochemical table is also provided.

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