Auxiliary material for this article contains a description of the methods, data tables for Mt St Augustine and Eyjafjalajokul, figures of 2004 Mt Etna and Eyjafjalajokull, and extended discussion of plume age estimate for Eyjafjalajokull.

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grl27485-sup-0002-txts01.pdfPDF document174KText S1. Extended description of methods (Mt. Etna, 2004 campaign), detailed data tables for Mt St Augustine, figure for 2004 Mt Etna, detailed data tables for Eyjafjalajokull, figure for Eyjafjalajokull, extended discussion of plume age estimate for Eyjafjalajokull, and references.
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