FIG. 3.

The mean acoustic admittance of the left (solid blue left-pointing triangles) and right (solid red right-pointing triangles) ears during flight as a function of time after embarkation. The error bars show the standard error of the mean. The dashed line shows the relative humidity as a function of time since embarkation. The humidity is shown with an arbitrary offset and scaling and has been included to enable a visual comparison between changes in humidity and changes in acoustic admittance; actual values of the humidity are shown in Figure 1. The open triangles at the left and right side of the figure show, respectively, the mean pre-flight and post-flight acoustic admittance that were measured in the terminal buildings for left ears (blue) and right ears (red). Take off was 21 min after embarkation, and landing was 161 min after embarkation.