Fig. 3. Steinabrunn, Austria. Magnetogram of the Neolithic ring ditch enclosure. The ditch is filled up by topsoil, but also the palisades and a pit in the centre of the enclosure, show up as a normal positive (black) anomaly. Magnetometer survey, CS-2 Scintrex magnetometer, sensitivity ± 1 Picotesla, in variometer (duo-sensor) configuration, 40 × 40 m grid, spatial resolution 12.5 × 50 cm, interpolated to 25 × 25 cm, total Earth's magnetic field at the site 48.090 ± 20 Nanotesla, date 5/1997: angle of dip +65°, grey shade plot in 256 greyscales from positive (black) to white (negative)