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Liquid Penetration Distance (LPD) evolution over ten cough cycles. Linear fit: with mask (a = −0.05, b ≈ 22.38) and without mask (a = 0.47, b ≈ 37). The environment is at ambient temperature, pressure, and relative humidity of 20 °C, 1 atm, and 50%, respectively. The mouth temperature is 34 °C and the face skin is 32 °C. The results are plotted from the end of the first cycle.
