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(a) B850 ring showing the alternating transition dipole moment orientations giving rise to the ninefold symmetry. The arrows placed over the Mg atoms show the transition dipole moments from the NB atom to the ND atom of each Bchl (Ref. 11). (b) Exciton spectrum of B850 shown with the familiar k-labels (Ref. 30). The arrows indicate the two states with the highest oscillator strength, the so-called 850 nm states.
