Sentences should never begin with an Arabic numeral. Figure placement . The same rule applies to tables. Tables should be numbered. Long column-headings requiring hyphenation should be avoided.
Abbreviated headers are acceptable.
The key to abbreviations should be indicated. Duplication in tables of material presented in the text or as graphs is to be avoided. Preferably, table data should be tab-delimited and readable in Microsoft Word . Authors should keep tables simple and not attempt to produce photo-ready copy as this only adds to production cost. Tables and figures should be referred to in numerical order in the text.