FIG. 8. The upper-left panel shows the reflection coefficient at the surface of the clay lens, and the lower-left panel shows the permittivity of the clay lens (conductivity is included in the imaginary component). The upper-right panel shows the reflection coefficient calculated from low noise survey data (thick lines) and data with a signal/noise ratio of 10:1 (thin lines). The lower-left panel shows the corresponding permittivity determined from the simulated data.