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Comparison of the longitudinal (pressure) acoustic waveforms for case 1 (a), case 2 (b), and case 3 (c) tablets with solid fractions of 0.85. Dashed lines show the mean average of the acoustic arrival times for tablets prepared with virgin unlubricated MCC powder (3.04 μs) (a), virgin lubricated MCC powder (3.22 μs) (b), and virgin unlubricated MCC powder formed using lubricated die–punch set (3.09 μs) (c)
