Average pre-Helmholtz transient time across the six repetitions shown in Figure 7. To create this visualisation, each of the six individual Guettler diagrams was first interpolated onto a common grid with 100 rows and 100 columns. Following interpolation, the average transient time was calculated for each grid point by taking the mean value across all repetitions. The observed “brighter” region represents a zone where the bow-string interaction generally leads to shorter pre-Helmholtz transient times.