Fig. 2. Illustration of experimental setting for diurnal light and F_v/F_m measurements in Montipora monasteriata. (A) Top view of the intact (i), and exposed (e) parts of the skeleton; the position of the coral clip (cc) and the light meter (lm) can be seen. The coral clip and light meter were mounted underneath or inside the endolithic algae layer hence the broken line. Note the green pigment of the endoliths in the exposed part. (B) Side view showing the two grooves drilled for each of the pulse amplitude modulated (PAM) light meters can be seen between the skeleton and the endolithic algae layer. Two PAM fluorometers were used simultaneously.