The official, published form of a paper in this Journal is the PostScript file (.ps file). The .tex file is made available only for the benefit of those who might wish to do text searches, etc., but the .tex file may not compile properly to produce the published form of the paper, due to lack of graphics, or due to other macros that may have been used by the authors and not be made available to the reader. Such graphics or other macros will not be provided separately by this Journal.