When looking at a graph that shows the proper distance at the time of emission as a function of the redshift z in a model-universe with only matter, the proper distance at time of emission has a maximum at about z ~ 1.7. What does this maximum mean?
I can see that light with a high redshift must come from a source, which was initially close to us, and similarly light with a small redshift also comes from close to us. But again, what about the in-between, i.e. the maximum?