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Procedures that are currently used to normalize raw aircraft noise data to refer ence weather conditions a r e reviewed. These procedures sometimes result in calculated values of molecular absorption which differ from measured values, especially at higher frequencies. An explanation is offered for this discrepancy, and its effect on normalized sound levels and on calculations of effective perceived noise level (EPNL) is examined.doi:10.1121/1.2001846 fatcat:ch2bn5woozdm3puhmv3jwmvmwm