I think part of the TU entry there is "Communicating Civilizations"

All those TL7- worlds aren't, really.

I could make a case that the 3I might not meet the criteria of
"communicating" . I mean, we're not going to pick up the data loading
transmissions used by X-boats.

On Wed, Sep 9, 2020 at 7:48 AM <xxxxxx@gmail.com> wrote:
>
>
> https://medium.com/@jan.knura/35-extraterrestrial-civilizations-in-the-milky-way-90f423dc90ce
>
> The english in the article is not so good. The research appears to be in preprint stages and originates from the University of Nottingham.
>
> Pessimistic view: 4 civilizations actively communicating.
> Average view: 35 civilizations actively communicating.
> Generous view: 211 civilizations actively communicating.
> Mean Separation: 17K light years (out of our ability to detect).
> The Generous view seems to lead to a seperation of a few hundred light years.
> Assumptions obviously made, some changes made to the Drake Equation (or at least particular choices of inputs).
>
> Hopefully this research will reach a printable stage and we can see the actual study/article.
>
> If the Generous view is taken, and distances between communicating civilizations are a few hundred light years, that would mean 100+ Jump-1s (ObTrav). I'm not sure the difference between Vland and Terra or Vland and Zhodane, etc, but they might fall within a few hundred to a thousand light years separation.
>
> The number of sophonts in the TU can't really be compared to these metrics simply because many may not have been communicating when contacted. There may be many more of those.
>
> Of course, if you went with the average case, 35 communicating civilizations around the galaxy, 17K ly separation, that's over 4K Jump-1s between.
>
> So the OTU, if these numbers have any validity (entirely questionable!), would need to fall under the Generous assumption.
>
> TomB
> PS - I look at these things as interesting and kinda fun, like gambling or astrology... I feel like the assumptions involved make the outcomes as valid as casting carved bones with runes on them to help make decisions.
>
> --
> “The only stable state is the one in which all men are equal before the law.” ― Aristotle
>
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