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Figure 2

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Boxplot visualization of the tuning values for perceived unisons as a function of pitch, categorized by instrument combination and dynamic level. The tuning value indicates the difference in fundamental frequency (in cents) when the adjustable tone and the reference tone are perceived to have the same pitch. Following a typical convention, boxes span an interval from 25th to 75th data quantiles with the median denoted by horizontal lines. The whiskers extend to 1.5 times the interquantile range, beyond which the individual data points are displayed as solid dots. The crosses indicate Terhardt’s virtual pitch values for the tone pairs where the calculated virtual pitch was within ±100 cents from the nominal fundamental frequency. Tone pairs in column A: contrabass clarinet – double bass; B: contrabass clarinet – tuba; C: contrabassoon – contrabass clarinet; D: contrabassoon – tuba; E: double bass – contrabassoon; F: double bass – tuba.

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