Two questions (my source from p. 56 of the GT and my output are attached).
1) does the second neume at the "e" of "ejus" exist in the gregall font to date? (I feel like I'm missing something…) The first neume is a pes, but the second looks like a clivis and shape-wise it's a diminutive liquescent, something like the climacus with the nabc ci~
so the neume with what I can manage so far is something like pecl``ci~lssta2lst2
but a) the spacing isn't right and I need to use ` to adjust it and b) the second significative letter is glued to the climacus (which seems less than ideal given its placement in the Triplex).
to me, shapewise, this note seems to be closer to the reverse of to!cl>
2) is it possible to have an isolated nabc significative letter? For example, at the end of the psalm verse, before the bar line, there is one not attached to a square notation (attached to the bar line would do, but I'm running into obstacles in the Neumz renderer and hesitate to try it out with my own LaTeX compilation).

