Glossary and description of graphic F PP(t) parameters (see Fig. 1)
Fo	experimental value of F exp in sSP (or SP) at t = 0.01 ms; normalization relative to Fo = 1 has been done
nF v	approximated by nF v = (F m – 1)/2 in which F m is the maximum of F exp at the P-level (see inset)
k L	slope (ms−1) of the initial F exp—rise in the 0.01–0.1 time range divided by nF v
β	fraction of Q B-non reducing RCs in dark-adapted sample; equal to amplitude of extrapolated slow decay component at t 0 (sSPoff) divided by (1 − exp(−k L × 0.25)) to account for the incomplete photoreduction of the fraction β at the cessation time (default t 0 = 0.25 ms) of sSP0.25
k AB	decay rate (ms−1) of fast decay component; its reciprocal value equals the length of the (green) vertical line (in ms) between the time t 0 (=0.25 ms) of sSP-off and the time at which the SSP-off slope (interrupted black line) intercepts with the decay curve of (red dots)
Approximation and tuning of ‘guess’ parameters to accommodate the matching of F PP at the junction of O–J and J–I phases
Ø	electron trapping efficiency, which is determined by limitation of rate of P+ oxidation at PSII donor site by that of radical pair recombination in fraction of Qb-nonreducing RCs with single reduced acceptor pair (Vredenberg 2004); actual value, usually in range between 0.1 and 0.5, obtained after varying a tuning factor for matching F PP with F exp at the junction of O–J and J–I phases (see under results)
k 2AB	oxidation rate of double reduced QB-nonreduccing [S0-] RCs in the range between 0.05 and 0.5 ms−1 obtained after varying the tuning factor for matching F PP with F exp at the junction of O–J and J–I phases (see under results).