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Scheme showing the relative positions of the digital projector, the imaging chlorophyll fluorometer components (the CCD camera and the LED panels emitting saturating pulses), the sampling area, and the projected actinic light mask (not at scale). For simplicity, two additional LED panels emitting nonactinic, measuring light, positioned perpendicular to the panels shown, were omitted. The horizontal arrow indicates increasing levels of actinic light in the light mask.
