# Edges associated to the variables in G.kirchhoff_symanzik_polynomial()

How do the variables t0, t1, t2,... in G.kirchhoff_symanzik_polynomial(), for a given undirected graph G, correspond to the edges of G? (i.e. what is the bijection between the variables ti and the edges of G?) The variables do not follow the same order as in the list G.edges(), which I thought was the case.