Left: scatter plot of for the time interval centered 24.5 hr before emergence vs. the time interval centered 8.5 hr before emergence for NE (black) and PE (red) regions. The Pearson correlation coefficient between the PE at these times is 0.98 ± 0.01, whereas for the NE it is 0.96 ± 0.01. Right: same scatter plot but between 24.5 hr and 3.2 hr before emergence. The correlation coefficients are both slightly lower at 0.95 ± 0.01 for PE and 0.94 ± 0.01 for NE, suggesting that much of the evolution of the flux occurs between 8.5 hr and 3.2 hr before emergence, which is consistent with the emergence process beginning (for some regions) during the final 6 hr before the time of emergence.