Autoplot with smoother

[timcdlucas]

trafficstars

formula3 = Y ~ f(region.struct, model="besag", graph.file = g) +
           f(region, model = "iid") + f(x, model = "rw2")

result3 = inla(formula3, family = "poisson", data = Germany, E = E)
autoplot(result3)

The smoother has x axis label "ID" which doesn't make sense.