To analyze content of a subterranean structure, electric field measurements at plural source-receiver azimuths in a predefined range are received. A digital image of a back side of a check may be placed in a computer memory. The wiring is provided in the inter-layer insulating film. The positioning mechanism is supported by the base member, and positions the object relative to the base member. A best candidate vector from the set of candidate vectors is utilized for the computation of soft bits representing the values of the transmit vector.