Figure 3.

The average NMR signal by hour (A) for the well watered (black squares) and water limited (red circles) epochs are qualitatively distinguishable. While the trend is very similar, the well watered signal is stronger at night and weaker during the day compared to the water limited data. By removing the signal variation predicted with the temperature model of Equation 2 (C) the differences in the signal behavior become clearer. The water limited data is well accounted for using the temperature model, but this is not the case for the well watered data. The average daily temperatures (B) between the two epochs are quite similar. Error bars come from the standard error.