The E major thirteenth chord is a 6-note chord consisting of the notes E, G#, B, D#, F# and C#.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Emaj13.
Interactive piano diagram for the E major thirteenth chord
Chords that are a subset of Emaj13. These contain less notes but all of them are included in Emaj13.