Option for giving the names (and printing) of the zero modes of the different fields. It is given as an association <|ϕ->{ϕ0,ϕ0}|> or <|ϕ->ϕ0|>.
Details and Options
The keys os the association must be the fields defined in the theory. To every field, we can either give the label of the zero mode or a list with the label and the printing of this label.