Original restitution from source, quilisma is from Hartker, devolved into a long pes later. The ending on FA is proper to the French tradition (Swiss has SOL)

Critical melody : http://omnigreg.at/wiki/doku.php?id=ant:0276 ; -it (posuit) could be changed to sol, but la is well represented in mss. su- (suo) is a virga in H but the mss have a consensus on the clivis.