[Calicem] salutaris [...]

Rubrics identifying occasion, position and genre are absent.One word remains visible on the remaining bottom two lines of chant. This word appears to be 'salutaris' and it can be proposed that the chant was the first antiphon of Second Vespers 'Calicem salutaris'. The melodic fragment supports this. On the lowest line, the notation is likely to be that for its differentia.