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Schematic of the pH probe in situ. Sensors were located 12 cm (E1), 6 cm (G1), 3 cm (G2), and 0 cm (G3) from the tip. With the probe correctly positioned, E1 was located 3 cm above the lower oesophageal sphincter (LOS), and sensors G1, G2, and G3 were located 3, 6, and 9 cm below the LOS.
