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The GM SWPF values (± GSD) (n = 24; 1 respirator model × 3 replicates × 8 test subjects) measured by the CPC, PAMS, and the reference SMPS as a function of test exercises at three concentrations: low (Figure 5a, 8 × 103 particles/cm3), medium (Figure 5b, 5 × 104 particles/cm3), and high (Figure 5c, 1 × 105 particles/cm3).
