Supplement to: Wagenbach, Dietmar; Graf, Wolfgang; Minikin, Andreas; Trefzer, Ulrich; Kipfstuhl, Sepp; Oerter, Hans; Blindow, Norbert (1994): Reconnaissance of chemical and isotopic firn properties on top of Berkner Island, Antarctica. Annals of Glaciology, 20, 307-312, hdl:10013/epic.15271.d001