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A rectangular array of values to import to the worksheet. The first dimension corresponds to row and the second to column.
Thus, an array of data { {"A","X"},{"B","Y"},{"C","Z"} } would be inserted into the worksheet as:|

If you enable DataImportProperties.Transpose , the format will be [row][column], so:
{ {"A","B","C"},{"X","Y","Z"} } would be inserted into the worksheet as:|