Figure 4. Data represent analysis of variance results between treatments for benchmark indices (BI) calculated during PE 1. Benchmark indices are listed along the y axis, and treatment along the x axis for a single data acquisition with a corresponding soil water content of 1.61% _v. Benchmark indices were calculated as follows: NDVI_BI = NDVI_predrought – NDVI, and GNDVI_BI = GNDVI_predrought – GNDVI. Means followed by the same letter are not statistically significant ( = 0.05). To differentiate between ANOVA results for the GNDVI_BI and NDVI_BI, letters followed by an asterisk (*) denote ANOVA results for NDVI_BI.