Fig. 5. Riekofen, Bavaria. The Neolithic site is enclosed by four concentric ditches, the two inner circles show up by a positive trace (black), the two outer ditches as negative (white) lane. Magnetometer survey with CS-2 Scintrex magnetometer in variometer (duo-sensor) configuration sensitivity ± 1 Picotesla, 40 × 40 m grid, spatial resolution 12.5 × 50 cm, interpolated to 25 × 25 cm, intensity of total Earth's magnetic field at the site: 47.920 ± 20 nT, date 4/1997, angle of dip +65°, grey shade plot in 256 greyscales from positive (black) to white (negative)