Figure : A) Calculated absorption spectrum of the FCP complex at 300 K (red) vs. the experimental results (green) . In addition, a test has been performed in which the part of the spectral densities above 800 cm -1 has been neglected (blue). B) Contributions of the Chl-a (violet) and the Chl-c pigments (green) to the total absorption of the FCP complex (red). tra is presented in Fig. . The computed spectrum has been shifted by about -1049 cm -1 towards lower energies with respect to the experimental one in order to align the maximum peak. As one can see, the overall line shape of the calculated spectrum is in reasonable agreement with the experimental counterpart. Moreover, we repeated the calculations ne-glecting the high-frequency parts of the Chl-a and Chl-c spectral densities above 800 cm -1 stemming from the intramolecular vibrations to get an insight into the origin of the side band. As can be seen in Fig. , the side band disappears, making it obvious that it is due to the vibrational progression of the Chl-a molecules and is not due to absorption peaks of Chl-c pigments as assumed earlier in literature . We note in passing that the latter spectrum was shifted by about -1452 cm -1 with respect to the experimental one due to the change in the reorganization energy for this modified spectral density . In the second set of analysis, we have repeated the calculations based on atomistic spectral density and give the results in Fig S13 . In this case, the side band is considerably higher than in the experimental spectrum, a phenomenon which we have observed already earlier in the case of the light-harvesting complex CP43 when using a spectral density determined using the same formalism as employed here .