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Shown below is a video clip (QuickTime movie, with captions) of the closed lab.
Depending on your network connection, it may take a few seconds to a few minutes to download this demo.

In this exercise, the students are trying to understand and explain what is shown in the spectral analysis view. They stumble at first but eventually come to the correct answer, understanding that the x-axis represents time, the y-axis represents frequency, and color intensity represents amplitude.