The A flat minor thirteenth chord is a 6-note chord consisting of the notes Ab, Cb, Eb, Gb, Bb and F.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Abm13.
Interactive piano diagram for the A flat minor thirteenth chord
Chords that are a subset of Abm13. These contain less notes but all of them are included in Abm13.