FIG. 2.

Effect of flight on the acoustic admittance of the middle ear for individual participants. Each plot shows the admittance of the left ear (blue left-pointing triangles) and right ear (red right-pointing triangles) against the time after embarkation. The take off and landing times are shown by arrows. The dashed black solid lines show the relative humidity during the flight. For participant PF5, it was not possible to get a tympanometer seal for the left ear, and recording from the right ear was discontinued 2 h after embarkation because of ear discomfort. For participant PF7, it was generally difficult to get a tympanometer seal for the right ear and not possible in the measurement period 134 min after embarkation (see main text). PF6 dropped out after the pilot study (outward flight).