MS Excel
Documentation should include

Information on the purpose of the workbook
Destination and users of the output data
Source of input data
All of these

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MS Excel
To center worksheet titles across a range of cells, you must

Widen the columns
Select the cells containing the title text plus the range over which the title text is to be enfettered
Select the cells containing the title text plus the range over which the title text is to be centered
Format the cells with the comma style

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