Spurred on by a detailed account on the New Liturgical Movement about the Sub tuum præsidium, I've been comparing the different versions of the chant for that Marian anthem, most of which are clearly variants of each other - Roman, Monastic, Dominican, Cistercian, Premonstratensian, the cantus firmus used by Obrecht in his eponymous Mass (disregarding the length of the notes) - but one, which is used as part of the Kneeling Prayers of Jasna Góra, and proper to that shrine's guardians, the Order of St Paul the First Hermit, is utterly different, and I can't work out its mode, as it ends on do. There is a recording of it available online also. Does anyone know its history or care to comment?

If anyone happens to have the Carthusian chant for this anthem, please post. Ditto for the Carmelite - frustratingly, I have a book containing it, but that book is somewhere inside a large pile of dozens of boxes not yet unpacked after moving house, since the new bookshelves haven't been delivered yet. (And just in case anyone has the Coptic text, which I have hunted for without success, do let me know.) Many thanks in advance!