Stable isotopes, bromine, iodine and sodium in surface snow along the 2013 Talos Dome - GV7 traverse (Northern Victoria Land, East Antarctica), supplement to: Maffezzoli, Niccolò; Spolaor, Andrea; Barbante, Carlo; Bertò, Michele; Frezzotti, Massimo; Vallelonga, Paul T (2017): Bromine, iodine and sodium in surface snow along the 2013 Talos Dome–GV7 traverse (northern Victoria Land, East Antarctica). The Cryosphere, 11(2), 693-705