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These maps were compiled using aeromagnetic profile data obtained from the National Aeromagnetic Database of Canada maintained by the Geological Survey of Canada. The data were obtained from aeromagnetic surveys flown at an altitude of 300m mean terrain clearance and surveys flown at constant barometric altitudes. The data have been digitally recorded or digitized from existing aeromagnetic maps. Flight line spacing varies from the GSC regional coverage standard of 800m up to 3200m for some industry data over areas of thick sedimentary basins.<\/SPAN><\/SPAN><\/P>

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