If arrows or letters are necessary, use a professional product such as Letraset . Each figure should have a label pasted on the back indicating the number of the figure, the title of the manuscript, the name of the first author, and the top of the figure. If photographs of persons are used, either the subjects must not be identifiable or their pictures must be accompanied by written permission for use. Legends to figures should be listed together on a separate sheet, identified by the title of the manuscript and the name of the first author. Units of measurement Measurements should whenever possible be given in the metric system.
Abbreviations Use only standard abbreviations.
Avoid abbreviations in the title and abstract. The full term for which an abbreviation stands should precede its first use in the text unless it is a standard unit of measurement.