F0	Minimal fluorescence from a dark-adapted leaf
FM	Maximal fluorescence from a dark-adapted leaf
FV	Maximal variable fluorescence from a dark-adapted leaf
FV/FM	Maximum quantum yield of primary PSII photochemistry
FV/F0	Ratio between variable and minimal fluorescence
O step	Origin fluorescence value at 20 µs
K step	Fluorescence value at 0.3 ms
J step	Fluorescence value at 2 ms
I step	Fluorescence value at 30 ms
P step	Maximum fluorescence or FM
Sm	Normalized area above the curve from F0 to FM
ABS/RC	Effective antenna size of an active reaction center (RC)
PIABS	Performance index for energy conservation from photons absorbed by PSII to the reduction of intersystem electron acceptors
PITOT	Performance index for energy conservation from photons absorbed by PSII antenna to the reduction of PSI acceptors.
ψE0	Probability that the energy of a trapped excitation is used for electron transport beyond QA
ψR0	Quantum yield for reduction in the end electron acceptors at the PSI acceptor side
δR0	Efficiency with which an electron from the intersystem electron carriers is transferred to reduce end electron acceptors at the PSI acceptor side
VK	Relative fluorescence at the K-step
ΔVIP	Relative contribution of electron flow to the PSI end acceptors (i.e., ferredoxin and NADPH)