From the article:
"At the archaeological site of Kerameikos archaeologists from the German Archaeological Institute brought to light a well probably used for hydromancy rituals. The well was revealed when archaeologists overturned a marble stone and it bore an inscription on the walls addressed to Apollo, the ancient Greek god of phrophecy and was probably used for divination in early Roman times, as the lettering suggests.
"The finding is exceptionally significant as it identifies the spot as the first and unique Apollo divination site in Athens, confirming the worshipping of the ancient god along with his sister Artemis and restoring the accurate interpretation of the site as a shrine rendered by K. Mylonas in the late 19th century to a third goddess, Hecate."