Mean ratings of the SAQI assessment for loudness (left) and interindividual variation in the ratings (right) as a function of distance pair (abscissa) and nominal source azimuth (shades of gray), pooled over presentation order and separated with respect to normalization method. The error bars in the mean plot (left) display 95% confidence intervals based on the respective one-sample t tests comparing the condition means against 0. The box plots (right) show the median and the (across participants) interquartile range (IQR) per condition; whiskers display 1.5 × IQR below the 25th or above the 75th percentile and outliers are indicated by plus signs.