The paper copy should be double spaced. No particular typescript width or style of type is required, because we do that here. The table titles should be brief. The column headings have any appropriate units in parentheses. Any headings that occur within the body and apply to a block of data should be centered.
Footnotes end with periods.
You do not need to actually insert the rules because we do that here, although your hard copy would probably be clearer if you do use the basic top and bottom rules. See a recent issue of the journal for examples of tables. No vertical or diagonal rules may be used in tables. Column headings must be upright, not turned sideways. There are no horizontal rules in the body of the table to separate sections, use white space instead.