This is not a Gregorio issue, but a general issue of Gregorian chant 
typesetting. I hope someone of you can elaborate. I'm talking here about 
typical Solesmes editions, Graduale Romanum in particular.

I understand that punctum mora on a note inside a neume acts as a so-called 
floating mark, i.e., without any metrical width. That's pretty obvious in cases 
when the neume is a ligature or it's tightly spaced on a note-to-note basis. 
Punctum mora then floats either inside a ligature or jumps up or down to avoid 
a collision with subsequent note.

Inside a larger neume cluster, though, when punctum mora falls at the end of a 
neume and some space then follows, such floating behavior wouldn't be, 
typographically speaking, necessary. Is it then possible that in such cases 
punctum mora could be bearing some space on its own for some reason or this 
would be strictly avoided by the editor? In other words, are there any cases 
that punctum mora at the end of a neume could somehow interact with a space 
following or all the spaces are fixed no matter what and punctum mora just 
floats inside such space? This, of course, is irrelevant at phrase endings, 
where punctum mora apparently gets some space because of justification along 
bars and other punctuation-like signs.

My best bet would be that punctum mora always behaves as floating mark, because 
it's just an editorial mark and all the notes and different spaces should be 
preserved in the exact way as with no morae being marked by a punctum in the 
first place. But I'm not a Gregorian chant scholar and could be that I'm 
missing something. I would greatly appreciate any feedback.


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