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. 2022 Mar 14;12(8):1943–1958. doi: 10.1007/s13346-022-01131-8

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© The Author(s) 2022, corrected publication 2022

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Fig. 9 — Variation of the average mesh size ( $ξ$ _a) for the 21 samples considered (black circles, before chest physiotherapy; white circles after chest physiotherapy). Grey circles indicate the relative percentage variation of the average mesh size $ξ$ _a (secondary vertical axis)