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Does Great Stella coalesce vertices and edges that coincide? I have some OFF models for which it says there are more than two faces meeting at some edges. That's not true in these models' abstract structure.

No Stella keeps them separate, so edges with 4 faces would count as two edges each with two faces.

But what you're seeing is only a warning, not an error. Just click OK and it should be fine.

Yes, I've been clicking through and it started to get old. I would modify the models to avoid the message but I can't figure out what's triggering it. I've checked carefully and each edge that exists appears exactly twice in the definitions of the faces. Thanks for ruling out one possibility.