[z2h-a6n]

Not on arXiv (unless I'm much mistaken), which is a preprint server, not a conventional journal.

arXiv accepts various flavors of TeX, or PDFs not produced by TeX [0], and automatically produces PDFs and HTML where possible (e.g. if TeX is submitted). In the case of the example paper under discussion, the authors submitted TeX with PDF figures [1], and the PDF version of the paper was produced by arXiv. The formatting was mainly set by using REVTeX, which is a set of macros for LaTeX intended for American Physical Society journals.

[0] https://info.arxiv.org/help/submit/index.html#formats-for-te... [1] https://arxiv.org/format/2312.12451

[smartmic]

FWIW, I recently learned that it is also possible to produce nice PDF papers with GNU roff (groff), have a look at this example: https://github.com/SudarsonNantha/LinuxConfigs/blob/master/....

[pimlottc]

Looks nice but seems strange to switch from two columns to one column after the first page? Although maybe they’re just trying to demonstrate its capabilities.

[macintux]

W. Richard Stevens (RIP, still hurts) famously used troff for his books.