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0rion nebula analysis procedures antenna beam antenna temperature apparent turnover frequency Arecibo telescope background brightness temperature background radiation beamwidth best fit brightness temperature distribution calibration signal carriage house clumps components confusing sources convolved derived results equation errors feed flux density data free parameters frequency brightness temperature frequency flux densities frequency scans function galactic latitude galactic plane galactic radiation gaussian half power beamwidth high frequency brightness high frequency data high frequency map HII region ionized isothermal electron temperature kinematic distance latitude scans line of sight low frequency flux main beam Mezger ness temperature nonthermal radiation observed brightness temperatures obtained optical depth optically thick outer regions present observations quency radio range receiver recombination line right ascension Rosette nebula Shaver sidelobe smoothed brightness temperature solid angle spectral index standard source subtended TABLE Terzian and Parrish theoretical spectrum tion Total Power ture values zenith angle