Fig. 2From: Volcanic ash in bare ice south of Sør Rondane Mountains, Antarctica: geochemistry, rock magnetism and nondestructive magnetic detection with SQUID gradiometerSchematic figures of three axes SQUID gradiometer system. a Cross section of a cryostat with three axes SQUID sensors. b Close-up of a gradiometer pickup coil and a SQUID. c Geometry of three axes pickup coils. d Photograph of assembled pickup coils and SQUIDsBack to article page