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In the above example, the top two table cells are set as table headers. To designate cells as headers, right click on the cell contents can select Cell > Table Cell Properties from the context menu.
In the Table Cell Properties modal, set 'Cell Type' to 'Header'. Also set 'Scope' as appropriate. If the the header is positioned above it's applicable data cells, set 'Scope' to 'Column'. If the header is to the left of the data, set 'Scope' to 'Row'.
