Peak-to-trough pressures recorded by all the sensors in the vertical
array that remained below the surface during the passage of the wave trains,
for measured wave heights of 8, 16, 28, 25 cm (the 25 cm wave was breaking
as it passed the sensor array). The data was averaged from 10 consecutive
wave peaks recorded once the wave train had become established. The dashed
curves show theoretical data calculated using nonlinear wave theory