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The fragment is in situ and is a parchment bifolium transmitting an antiphonary, with hymns for the Common of Saints (part 2) and the feast of the Ascension of the Lord (part 2), written in a Southern Gothica Textualis datable to the XIII century (note the terminatio sevovae, which is typical though not exclusive of Iberian MSS). As Laura Albiero suggested to me, the ligatures between neumes point to an Italian origin of the fragment, possibly from a manuscript produced in a cathedral (not an abbey).
(Leonardo Costantini (University of Bristol))Download this page
Gubbio, Biblioteca comunale Sperelliana, III 41 H 11, colour_chart – Antiphonary — https://fragmentarium.ms/view/page/F-o75w