Dynamics of the parameters describing the bimodal distributions. (A) Example of a bimodal distribution composed of two clusters of pixels grouping in two modes. The higher mode (max; with the highest F
m values) represents the healthiest parts of the rosette whereas the second mode (min; with the lowest F
m values) represents damaged/senescing parts of the rosette. Each mode i of the mixture distribution of F
m values is characterized by mean μi, standard deviation σi and weight ρ
. (B-G) Dynamics of μmax and μmin of F
m values, σmax and σmin, and, ρmax and ρmin in well-watered (WW) plants and under severe water stress (SWD; surviving and perishing plants) as a function of days after four-leaves stage (beginning of SWD) until bolting. Data are means (± SE) of 13–29 plants.