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1. This is evident by looking at the position of the coastline (defined by the color transition from blue to green) from the merged IBCAO/ETOPO5 data as compared to the coastline (shown as white squiggly line) as taken from an accurate coastline data base.
2. By comparison, when the maps scale factor is used there is almost an exact match between the merged IBCAO/ETOPO5 data coastline and the accurate coastline data base.