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                <term xml:lang="en">far-field approximation</term>
                <term xml:lang="en">mono-static configuration</term>
                <term xml:lang="en">multistatic data</term>
                <term xml:lang="en">direct sampling method</term>
                <term xml:lang="en">Kirchhoff migration analysis</term>
                <term xml:lang="en">classical Kirchhoff migration technique</term>
                <term xml:lang="en">multistatic configuration</term>
                <term xml:lang="en">far-field hypothesis</term>
                <term xml:lang="en">small obstacle hypothesis</term>
                <term xml:lang="en">far-field patterns</term>
                <term xml:lang="en">asymptotic formula</term>
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                <term xml:lang="en">imaging efficiency</term>
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