A maj13 — Dobro

A maj13 is A – B – C# – E – F# – G#, and no bar position on the dobro's GBDGBD strings sounds all of it — not straight across any fret, not on any short slant.

When a tune calls it anyway, the dobro plays the part of the chord a bar can reach, or a single-string line through it, and leaves the guitar and the mandolin to carry the rest. That is ordinary work for this seat, not a failure of it, and nothing is drawn here because a grip the bar cannot hold would be a lie.

A is the ii of G, the I of A and the V of D, so the caller will still count it — the seat just answers it with fewer strings.