# Photons
[A, A, +, external]
# Gluons
[g, g, +]
# Quarks & antiquarks
[q, Q, -]
# Heavy quarks (tops) & antiquarks
[t, T, -]
# Ghosts (gluonic)
[c, C, -]

# Vertices
[Q, q, A]
[T, t, A]
[Q, q, g]
[T, t, g]
[C, c, g]
[g, g, g]
[g, g, g, g]
