This interlocked pair of tenor parts is stated four times, following a diminution scheme in which the identical notation is interpreted under four different mensuration signs, first in tempus perfectum in integer valor (each longa transcribed as a 6/2 bar), then in tempus imperfectum in integer valor (transcribed as 4/2), then in tempus imperfectum diminutum (4/4), and finally in tempus perfectum diminutum (6/4), resulting in total length proportions of 6:4:2:3 (Wright 1994, 397–98).