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For basic background information about DCW, see the [Wikipedia\nentry](http://en.wikipedia.org/wiki/Digital_Chart_of_the_World).\n\nDCW-GMT is an enhancement to DCW in a few ways:\n\n- It contains more state boundaries (the largest 8 countries, Great Britain and Norway are now represented).\n- The data have been reformatted to save space and are distributed as a single deflated netCDF-4 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