Importantly, though, latex does not shrink the value of this parameter automatically if you reduce the font size of the contents of the textdata columns. Hence, your table is going to look like it contains an awful lot of whitespace if the datatext are going to be set at 5pt (tiny) or 7pt (scriptsize). By using the default font you wont get a font size smaller than tiny. latex knows several font size modifier-commands (from biggest to smallest) huge huge large large large normalsize (default) small footnotesize scriptsize tiny. A table of the exact font sizes in points can be found on wikibooks. A good rule of thumb is dont use too many different sizes and dont make things too smallbig. Notes i want to keep the html commands list free from hacks resorting to the use of the symbol font, but this can mean that some of the entity codes listed here will not display properly in older browsers.