All whiskers are placed in standard orientation.

In this figure, the proximal 15% of each whisker is aligned with the positive x-axis (horizontal). In the actual optimizations for different models, between 1~20% of whisker length was aligned with the x-axis. Scale bar: 20 mm. Inset: Histogram of whisker length (unit: mm). In each histogram the bin value adds up to the total number of whiskers shown in Table 1.