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Scatter plots of ASY-H against PCC index values. (a) Display of individual ASY-H-PCC samples. (b) Display without samples. The black squares indicate average values and number of 15-min samples within each unit interval in PCC, while the error bars at every other unit interval indicate standard deviation. The red dashed lines indicate least squares regression on the 15-min data samples (Eq. (7)). Note the good fit to the interval-average squares.
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