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When opening a table window in ArcMap, some field names have an underscore character (_) at the end.
If a field name is a reserved word, an underscore is appended to ensure that the field is interpreted properly by the system.
For more information on which words are reserved, see the document in the Related Information section below.
If you are using textfile tables, it is recommended you rename these fields. This avoids potential problems and confusion about the field name. To rename the field: