Figure 5: This screen grab shows the double spike in the sent bytes and received bytes variables. The log returns are negative jumps as shown by the descending peaks. The sound files spike2 1s a.wav and spike2 1s.wav demonstrate how this sounds at playback speeds of 1 s per record, using the absolute and signed log returns respectively. spike2 20ms a.wav is the same traffic segment but played back at 20 ms per record and using absolute (unsigned) values.
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