Fig. 5. Comparison of traditional and electronic publication. The three pathways to users start with the same files on the same computer. In traditional publication, the files are used to create the plates for centrally printing issues and reprints. In electronic publication they are used to print PDF files that are moved to a WWW server. [If articles are posted in HTML (instead of, or in addition to, PDF), composing the HTML adds an expensive initial step to e-publication.]