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The forth field, Autosized, lets you specify automatic resizing behavior for a header column. The edit table resolves autosized header columns thusly: if the total width of all columns is less then the table's width, then all autosized header columns are equally sized in such as way that all columns fit perfectly within the table. If the total width of all columns is greater than the table's width, then all autosized header columns revert to their preset Width values.