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Loss factor versus frequency for modes excited by plucking the top string of (a) the guitar; (b) the banjo. Red circles and stars: measured values; blue stars: values from synthesised notes; black dots: predicted loss factor for energy flow into the body alone, calculated from the measured admittances shown in Figure 5. The analysis method cannot detect modes significantly above the magenta line. Green dashed lines indicate decay time constants (ωη)−1 = 50 ms (top line), 100 ms, 200 ms, 300 ms and 400 ms (lowest line). Blue dashed line in (a) shows the internal loss factor of the string.
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