Here It looks like this:
[980α] ...ἄνθρ......τοῖς δ᾽...[980β]...[981α]  καὶ δοκεῖ ... φησὶ Πῶλος, ἡ  δ᾽ ἀπειρία ... ἐστίν:  ...
I get that the
980α and the like are section numbers, but I'm not sure what the other one like
 is. The book starts at 21, maybe that means it's starting at line 21 and something is missing at the beginning, I'm not sure. Wondering what it means.
Also wondering what the "section" means. Here they have books and chapters, not sure why these sections are numbered like this.