<i>Instantaneous</i> P-E curves (left column: A, C, E) and corresponding <i>time-integrated</i> P-E curves (right column: B, D, F) of the coral species <i>Stylophora pistillata</i> (A, B), of different individual reef corals and algae (C, D) and of different reef communities (E, F).

P = photosynthesis or productivity, E = irradiance, PAR = photosynthetically available radiation, values within the graphs A, C and E = Ek/Emax, values within the graphs B, D and F = correlation coefficient r.