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the distribution of energy as a function of frequency for a particular sound source
the number of observations in a given statistical category
the number of observations in a given statistical category
the normal brainwave in the electroencephalogram of a person who is awake but relaxed; occurs with a frequency of 8-12 hertz
the normal brainwave in the electroencephalogram of a person who is awake but relaxed; occurs with a frequency of 8-12 hertz