Supplementary Material for: Measuring the electrical charge and settling velocity of volcanic ash particles with a new, cost-effective apparatus (VoltAsh) both in the laboratory and in the field

This repositery contains supporting information accompanying the submission of the manuscript entitled: "Measuring the electrical charge and settling velocity of volcanic ash particles with a new, cost-effective apparatus (VoltAsh) both in the laboratory and in the field" by Fries, Rossi, Iversen, Matsuyama, Arlaud, Lemus, Thivet, Diaz-Vecino, Simionato and Bonadonna. The manuscript has been submitted on 06 October 2025 to Bulletin of Volcanology. All the files present in this repositery are described in the file "supplementary_material_Fries_VoltAsh.pdf". Please refer to that file for additional information on the data present in the repositery.