What does the cell reference A10A13 mean?

The cell reference A10A13 appears to be a typographical error, as it combines two separate cell references (A10 and A13) without a proper operator or separator. In spreadsheet applications, references like A10 and A13 typically indicate specific cells in column A and rows 10 and 13, respectively. If you meant to refer to a range of cells, it should be formatted as A10:A13, which signifies all cells from A10 to A13, inclusive.