Everything the method rests on, in one picture. Forty-one dated assemblages as bars, and the five independently dated events as vertical lines across them: two Augustan camps, the naval base at Velsen, Vesuvius, Inchtuthil. The bars that cross a line are drawn darker — those are the assemblages the model puts in circulation at a moment somebody else dated for us. The five reference assemblages must each cross their own line, because that is the criterion that fixed tau, and Pompeii's crosses by a fifth of a year. A future revision that broke the calibration would show here as a bar sliding off its line, before any number changed in the documentation.
?kind is terminus are drawn as fixed points across the intervals
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