Second-level heading:
The line break was forced via #math80#\\

Here is the first sentence in Sec. #sec:level2#19>, demonstrating section cross-referencing. The command <#359#>#math81#\narrowtext<#359#> will make the text this width. The command <#360#>#math82#\widetext<#360#> will make the text the width of the full page, as on page #wideeq#22>. A blank input line tells TEX that a new paragraph begins.

The width-changing commands only take effect in galley style (the default style). Preprint style gives output of a constant width.

This file may be run in both preprint and galley styles. Preprint format is used for submission purposes. Galley format is used in production to produce final output.

When commands are referred to in this example file, they are always shown with their mandatory arguments, using normal TEX<#23#><#23#> format. In this format, 2, 3, etc. stand for mandatory author-supplied arguments to commands. For example, in 4 the 5 stands for the text of the author's section heading, and in 6 the 7 stands for the title of the paper.

Reference citations in text use the command 8. 9 may contain letters and numbers. In the reference section of this paper each reference is ``tagged'' by the 10 command. 11 should be <#24#>identical<#24#> in both commands. The proper form for citing in text is 12, and the result is shown here [#smith82##1###,#jones78##1###]. We will cite other people [#smith82##1###,#jonessmith80##1###] and journals here. We also cite other people again (Refs. <#27#>smith82<#27#> and <#28#>jonessmith80<#28#>). It is worth mentioning that REVTEX<#29#><#29#> ``collapses'' lists of reference numbers where possible. We now cite everyone together [#smith82##1###,#jones78##1###,#jonessmith80##1###], and once again (Refs. <#31#>smith82,jones78,jonessmith80<#31#>).

When the <#32#>prb<#32#> option is used, the command 13 will put the reference citations on-line. It was used in the preceding paragraph. Note that the location of citations must be adjusted to the reference style: the superscript references in <#33#>prb<#33#> style must appear after punctuation; other styles must appear before any punctuation. This sample was written for the regular (non-<#34#>prb<#34#>) citation style, but invoking the <#35#>prb<#35#> option will show the results of the command 14 in the preceding paragraph.