This is Fig. 1 from our preprint, found here:
Fig. 1. Panel (A) depicts the testing setup conducted with free-contact savanna elephants while (B) shows the testing setup conducted with Asian elephants in protected contact. Free contact allows for direct interaction with the elephants; protected contact means a barrier exists between humans and the elephants. Panel (C) shows an example of the testing bucket in which a vial of either the target odour or control odour is hidden and (D) illustrates an Asian elephant smelling through the holes in the lid during the experimental procedure.