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Determining bias in mass-normalized response with four random filter samples (F013, F031, F096, H125) at various PM concentrations. Filters F013, F096, and H125 have no significant slope at a 95% confidence level. Filter F031 has a power fit of y = 0.2403x−0.694 with R2 of 0.95. Error bars represent standard deviation of three replicates.
