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Fig. 9. —Graph shows regression lines through most broadened spectra from stone (), 40 and 60 wire meshes attached to each other (), and flat surface (+). Each symbol represents mean absolute spectral frequency above or below baseline at each pulse repetition frequency at Doppler gain of 65% for given structure. Error bars correspond to SDs. Different slopes of regression lines reflect different levels of spectral broadening as function of roughness. This clearly shows that stone had most broadening. Dot—dashes represent regression line for stone, dots alone represent regresion line for 40 + 60 mesh pair, and solid line represents regression line for flat surface.

Return to article Hotlight (NEW!) What's Hotlight?