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1/3-OCTAVE FREQUENCY BAND 21 Zl Zl 24 26 PREFERRED 26 PREFERRED 1/3-OCTAVE 866 Absorption Coefficients absorption studies accuracy acoustic data acoustic flight test acoustic tests aircraft position airplane altitude analysis April 18 ARP 866 Absorption atmospheric absorption coefficients attenuation coefficients BAND NUMBER Figure Boeing Company calculated climb angle Coefficients for Test Composite Plots computed DEGRE distance dynamic range effects Estimated Sample Variances Experimental and ARP flightpath FREQ FREQUENCY BAND NUMBER ft 6 ft ft ft ft gradients Grant County Airport Ground Reflection high frequencies Lithium chloride meteorological measurements Microphone height Moses Lake NASA noise floor number of microphones October 22 overhead parameters Plot of Differences PREFERRED 1/3-OCTAVE FREQUENCY procedure radar radiosonde recorded regression line relative humidity runway sensor series 15 sideline microphones slope speed of sound stadimetric camera stratified atmosphere Summary Plot surface temperature and humidity Test Condition wind gradients wind speeds Zl 21 Zl