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FIG. 1. Geometry of the problem of reconstruction of the location of a buried object from GPR measurements at the air–soil interface (a is the semi-extent along the x axis of the investigation domain; zmin is the minimum depth of the investigation domain; b is the semi-extent of the investigation domain along the depth; xM is the semi-extent of the measurement (observation) domain; 
b and 
b are the relative dielectric permittivity and the electrical conductivity of the soil; and µ0 is the magnetic permeability of the free space).
