Vanash's copy and paste table method works best if you have the text entry box in WYSIWYG mode (left hand icon in toolbar of quick reply box).
Otherwise, if you're familiar with the HTML table markup method, go with Source code mode, Go Advanced (button below Quick Reply box), know the dimensions of the table you want to create, then use the Table button in the toolbar to get the basic structure in place. From there it's a matter of putting in the cell contents and tweaking some of the formatting elements if necessary.
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