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Fig. 6. —Graph shows regression line through mean absolute Doppler spectral values as function of pulse repetition frequency for flat surface at Doppler gain of 65% over pulse repetition frequency range of 1250-10,000 Hz. Ninety-five percent confidence interval curves around regression line are so closely applied as to be invisible because of large amount of data collected for each point. Each point represents mean absolute frequency at corresponding pulse repetition frequency. Mean values are represented by plus sign, and error bars represent SDs. Regression equation is y = 0.0018x+0.075.