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Gets the position of the add-on text on the EAN-13 barcode.
In the example below, cell A1 provides the 12-digit primary code and "12"
passed to the formula is the separate add-on text.
string AddOnLabelPosition { get; }
ReadOnly Property AddOnLabelPosition As String
worksheet.Range["A1"].Value = "123456789012";
worksheet.Range["B1"].Formula = "=BC_EAN13(A1,\"rgb(0, 0, 0)\",\"rgb(255, 255, 255)\",1,\"bottom\",\"12\",\"bottom\",,\"normal\",\"normal\",\"none\",\"center\",12,11,7,0,0)";
IEAN13 barcode = (IEAN13) worksheet.Range["B1"].Value;
string primaryCode = barcode.Value;
string addOnLabelPosition = barcode.AddOnLabelPosition;