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Fig. 5. A 24 h cycle of Fv/Fm of exposed endoliths (filled circles) and endoliths under intact tissue (open circles) (mean ± S.D., N=4) as recorded every 20 min in the skeletons of M. monasteriata. The inset shows the average (N=3 days) light intensities inside the skeleton, under intact tissue (filled circles) and in exposed skeleton (open circles) during the days of the experiment.