<p>It was obtained after PLS-regression with the HSV-variables () as predictors (blue dots), and photosynthetic efficiency (<i>P</i>) as response (red dot). The outer circle represents 100% explained variance and the inner circle 50% explained variance for the different variables. The plot showed that the predictor variables are highly correlated to the response variable. A prediction of the photosynthetic efficiency using the HSV-values is therefore possible for our experiment.</p
