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Figure 11. Awakening frequency and maximum levels of flight noise events. Regression line according to Hofman (Airplane), regression line derived from data set according to Griefahn et al. (Revision) and best fit line as calculated by Griefahn et al. (1976), depicted within maximum level range 40-100 dB(A).

Figure 11. Awakening frequency and maximum levels of flight noise events. Regression line according
to Hofman (Airplane), regression line derived from data set according to Griefahn et al. (Revision) and
best fit line as calculated by Griefahn et al. (1976), depicted within maximum level range 40-100 dB(A).