Every row of the box plot, in the order the figure draws them. The interval bounds come out of OWL-Time rather than from a column: the time-span has a beginning and an end, each of which is an instant holding a numeric position on a named scale. That indirection is what lets the calendar reading and the arithmetic position disagree about negative years without either being wrong.
?from and ?to columns
Also available as a plain file:
dated-findspots.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.