Answers in the perceptual test, merged by “symmetrical” pairs (e.g. PC/FS and FS/PC merged together into “PC vs. FS”). As in Figure 1, the second configuration is rated on the scale in comparison to the first one, i.e. “PC vs. FS” is the comparison of FS with respect to PC. Only pairs concerning the PC configuration are shown. Distributions are separated with respect to frequency band of interest: 1319 (left), 2006 (center), and 2720 Hz (right). The triangles indicate individual ratings (ratings from the same participant have the same color). The horizontal bars represent the median of each distribution. For ease of reading reasons, small horizontal and vertical offsets are used for displaying the individual answers as black triangles (each answer originally is an integer number between −3 and 3).