Officially 13th chords use these degrees of the major scale: 1, 3, 5, b7, 9, 11, 13 though in practice some notes are left out. The most important notes are the 3rd, b7, 13th, 9th, root, 5th and lastly the 11th in roughly that order.
C13th uses the notes: C, E G, Bb, D, F, A
Our inversion uses the notes in this order: C, Bb, E, A
Tune in tomorrow for another Guitar Chord Of The Day.