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. Author manuscript; available in PMC: 2021 Jun 3.

Published in final edited form as: Build Environ. 2019;163:10.1016/j.buildenv.2019.106275. doi: 10.1016/j.buildenv.2019.106275

Figure 6. — Mass normalized OP^EPR of indoor particles shown as a function of mass normalized OP^EPR of outdoor particles, indoor RH, and indoor temperature. The error bars on OP^EPR depict the standard deviation of triplicate samples, and the error bars for other variables depict the standard deviation and measurement uncertainty of all measurements over the 4-day sampling period. The dotted line depicts the regression line calculated from the linear regression model developed with the three variables.

Figure 6. — Mass normalized OP^EPR of indoor particles shown as a function of mass normalized OP^EPR of outdoor particles, indoor RH, and indoor temperature. The error bars on OP^EPR depict the standard deviation of triplicate samples, and the error bars for other variables depict the standard deviation and measurement uncertainty of all measurements over the 4-day sampling period. The dotted line depicts the regression line calculated from the linear regression model developed with the three variables.