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intensities.These variations maymask the TC effects of buried metal objects and thus make it very <br /> difficult to determine whether the variations are associated with below ground metal or known <br /> above below ground cultural features. <br /> Apart from the physical limitations of the instrument and the unwanted.effects from secondary <br /> objects,the abilityto detect subsurface features is also dependent upon the densityofdata acquisition <br /> points. If the distance between data acquisition points is significantly larger than the size of the <br /> target object, then the object may not be detected. <br /> A-5 <br />