entity_id,source_id,evidence_type,source_note
ENT_ECHO,SRC_OVID_METAMORPHOSES,direct attestation,"Ovid, Metamorphoses 3.339-401: the nymph wasted to a voice in the Narcissus episode."
ENT_ECHO,SRC_THEOI_HOME,index attestation,"Attested in Theoi Project index (Greek gods, spirits, heroes in classical literature)."
ENT_ECHO,SRC_THEOI_NYMPHS,index attestation,Literary attestation in classical/mythographic tradition; cult evidence varies by entity.