Maximum deviations for repositioning the headphones eight times for each participant in Aachen and in Oldenburg. For each frequency the maximum level [dB] minus the minimum over up to eight repetitions is taken. Left diagram relates to the left and the right diagram to the right ear. Red line shows the median (smoothed by one-twelfth moving average window). In transparent blue the range of 75% of measurement data around the median is plotted. Gray lines indicate an individual measurement. Dashed lines indicate a measurement in Aachen, dotted lines measurements in Oldenburg.