Fig. 2
The variation of PRI directly after change in light condition. The results of fitting \({\text{ln Y}} = { \ln }\left| {{\text{PRI}} - {\text{PRI}}_{\infty } } \right|\) for t < 10 s with a linear equation are given in the figure. Subplot letters correspond to the letters in Fig. 1, the broken line connects the PRI values measured after the first ten data points used in line fitting