The BHS so-called "paragraph" markers (pe and samekh) do not actually occur in the Leningrad Codex. The editors of BHS use them to indicate open space deliberately left blank by the scribe. Pe ("open" paragraph) represents a space between verses, where the new verse begins on a new column line. This represents a major section of the text. Samekh ("closed" paragraph) represents a space of less than a line between verses. This is understood to be a subdivision of the corresponding "open" section. Since these markers represent an actual physical feature of the text, they have been retained.
The WLC source is maintained by the Westminster Hebrew
Institute, Philadelphia, PA (http://www.wts.edu/resources/alangroves/grovesprojects.html).
The main Hebrew text in ISA, the "WLC", has no vowels or cantillation, but in the sublinear "WLC_v" the vowels are included.