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Hmmm ..
Seems to be as much about playing with parameters in the models as anything else.
The assumed shapes of dark matter halos of galaxies is clearly a major issue as the shape (& hence mass) drives so much of galaxy motion variables.
Wish they could figure out what it is and how it behaves with more accuracy.
Oh well .. we live in the hope they'll find out some day. (Hopefully while we're all still around).
Cheers
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