Figure 4. Effect of soil moisture on the mean estimates ofg1 in respect to soil VWC (soil Volumetric Water Content) categories (low VWC < 12%, medium VWC 12 – 16.99% and high VWC ≥ 17% of 24h average of the Volumetric Water Content on the day of measurement). Panel a represents closed canopy with n= 982 and panel b represents open canopy with n = 1604. Whiskers extend to the largest or lowest value but no further than 1.5 times of interquartile range above and below the hinges of the box plot with the median. Any observations outside this range are denoted as individual points. The horizontal line inside the box denotes the median of the values.