PRECISION. Collocated precision results for units #121 and #123 are summarized in Table 3-3. A portion of this dispersion is due to a bias between the instruments. Transforming the hourly data for #123 using a constrained linear least squares regression of #123 on #121 (slope 0.881) yields a collocated precision of 2.9 μg/m3 (13.0%).
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Sources: Cooperative Agreement, Cooperative Agreement