A previous version (printed in the Psalterium Festivum draft) was from the franciscan mss, but it was all wrong. The correct way to understand this antiphon is that it is a contrafactum of the A/ Alleluia ego sum vitis, which unlike this one is from Hartker himself (cf. the listed source). Only KA and E611 match H's version of the A/ Alleluia ego sum vitis, and they agree, and they also agree on the A/ Alleluia noli flere, so the neumation is from the A/ Alleluia ego sum vitis, and the melody is from those two mss.