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Fig. A2. Balloon pressure transducer setup. The balloon is stretched to a 2-D disk
using a wire and is glued to the end of a tube (grey line), which is connected
to a Luer lock adapter (thicker grey line). The adapter is connected to a
syringe filled with water and a pressure transducer. The balloon, syringe and
pressure transducer were held in the horizontal x–y
plane, as shown in the top-view scheme, to minimize variations in pressure
(P) with water height.