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Five events dated by something other than samian — coins, dendrochronology, a volcano, the historical record — and the assemblage each of them bounds. Every one of these intervals must contain its own terminus, because that is the criterion that fixed tau = 6 in the first place, so this query is also a self-test. margin is how much room the model had to spare at the nearer edge: Pompeii is the tightest, which is why it is the reference that binds. Velsen is marked withheld — it appears in the figures but was kept out of the criterion, because activity continued on the site and the terminus may bound the base rather than the assemblage.

Also available as a plain file: termini.rq. The graph is fetched as a static file and queried in your browser with rdflib under Pyodide — there is no endpoint, and nothing you type leaves your machine.