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(a) Through-transmission speed-of-sound measurements based on 5 single element transducers, the different coloured curves specify through which side of the block the signal was acquired and to what measurement it was referenced. (b) Attenuation measurements based on comparison of the received spectra through samples of 2 different thicknesses, 3.97 mm and 5.97 mm, using the same set of 5 transducers. The dashed line shows a mean of the fits to the individual measurements.
