(a) The points along f = 3 MHz indicate the velocities at the angle of incidence where the Schoch effect appears. The error bars represent the estimated errors by measurement uncertainties (0.1° for the angle and 1 m/s for the sound velocity in water). (b) The enlarged area around A6, A5, and S3, for the clarity of points’ locations. (c) to (g) Further magnification shows snapshots of groups of points predicted to correspond to each mode. Note that in figures (c) to (g), the plots are not to scale in terms of velocity (vertical) axis from one snapshot to the other since the primary purposes are to show the relative positions of points and the variance of the angle of incidence at which the Schoch effect appears.