MS Excel
A circular reference is

Geometric modeling tool
Always erroneous
A cell that points to a drawing object
A formula that either directly or indirectly depends on itself

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

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
Widen the columns

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