Fig. 7. Reloj Solar, Peru. A very typical star shaped magnetic anomaly of a lightning strike on a trapezoidal Geoglyph. Magnetometer survey with Smartmag SM4G-Special caesium-magnetometer, sensitivity ± 10 Picotesla, variometer (duo-sensor) configuration, 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: 25.350 ± 20 nT , date 8/2005, angle of dip -5°, grey shade plot in 256 greyscales from positive (black) to white (negative)