The contents of the data table is returned in the following format:

[
    ["cell A1 contents", "cell B1 contents"],
    ["cell A2 contents", "cell B2 contents"],
    ["cell A3 contents", "cell B3 contents"]
]

Note that all values are returned as strings, including numbers.

Empty cells will have a value of "", e.g. [["", "", "123"]] will show nothing in cells A1 and B1 and 123 in cell C1.