Glossary and description of graphic F PE(t)- and F CET(t) parameters additional to those of F PP(t)
k qbf	rate constant of increase in variable fluorescence during the thermal phase at which the photochemical trapping has reached an equilibrium steady state; it is attributed to the overall rate constant (ms−1) of lumenal proton transfer reactions that result in local pH change at the QA–QB redox side of PSII
k -qbf	rate constant of dark reversion of variable fluorescence induced during the thermal phase; it is attributed to the re-oxidation rate (constant) of RCs with a double-reduced acceptor pair ([PheQA]2−)
IP	amplitude of IP phase set equal to F SP m– [$F_{\text{m}}^{\text{PP}}$ + F PEm]
k IP	rate constant that determines the increase in F v during the I–P phase
k -IP	rate constant determining the major decay component of F v in the dark
N IP	integer (0 < N IP < 10) to accommodate delay and steepness of F v during I–P phase (F CET(t))