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|A 13 chord intervals and notes|
|Intervals||1 - 3 - 5 - b7 - 9 - (11) - 13|
|Notes in A 13||A - C# (Db) - E - G - B - D - F# (Gb)|
13th chords are formed by adding a 13th (6th) interval note to a dominant 11th chord, so adding the 13 to 1 - 2(9) - 3 - 4(11) - 5 - b7) to form 1 - 2(9) - 3 - 4 - 5 - 6(13) - b7. Notice that this results in 7 notes, but only 6 strings on the guitar, meaning at least one of the notes needs to be emited. The most important degrees in this chord are 1 3 6(13) b7, and in general the first note you would leave out is the 11th (4th).
Here are 6 voicings of the A13 guitar chord, with a chord chart to each voicings' fingering.
When playing barre chords, make sure you move your wrist forward further than you would with open chords, this allows for more added pressure to your first finger.
Chord theory is helpful in undertanding why each chord is played the way it is. If you really want to advance, learn the theory behind chords as well.