Abstract: Volcanic gas CO2/SO2 ratios in the plume of Etna Volcano (2006-2011 period), acquired using a Multi-GAS of the INGV-PA monitoring network. Data are reported for the bulk plume released by the Central Crater. All ratios are expressed on molar basis. Note that this file includes only processed data showing ratios of gases (calculated using the Ratiocalc software). Other Description: Aiuppa, A., Moretti, R., Federico, C., Giudice, G., Gurrieri, S., Liuzzo, M., Papale, P., Shinohara, H., Valenza, M. Forecasting Etna eruptions by real-time observation of volcanic gas composition (2007) Geology, 35 (12), pp. 1115-1118. Aiuppa, A., Cannata, A., Cannavò, F., Di Grazia, G., Ferrari, F., Giudice, G., Gurrieri, S., Liuzzo, M., Mattia, M., Montalto, P., Patan, D., Puglisi, G. Patterns in the recent 2007-2008 activity of Mount Etna volcano investigated by integrated geophysical and geochemical observations (2010) Geochemistry, Geophysics, Geosystems, 11 (9), art. no. Q09008 Patanè, D., Aiuppa, A., Aloisi, M., Behncke, B., Cannata, A., Coltelli, M., Di Grazia, G., Gambino, S., Gurrieri, S., Mattia, M., Salerno, G. Insights into magma and fluid transfer at Mount Etna by a multiparametric approach: A model of the events leading to the 2011 eruptive cycle (2013) Journal of Geophysical Research: Solid Earth, 118 (7), pp. 3519-3539.