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Effects of digital projector light flickering (arrows) on the recording of chlorophyll fluorescence immediately prior to (for the determination of Fs) and during (for the determination of Fm′) a saturating pulse (SP) emitted by a sample exposed to actinic light (AL) of 260 and 850 µmol m−2 s−1. Values were normalized to the first measurement. r.u., Relative units.
