Figure 5.

2D S_kI (Ω₁,t₂,Ω₃) signals of the Q_y band of the FMO complexes from two species of bacteria: Chlorobium tepidum (C.t.) and Prosthecochloris aestuarii (P.a.). A, B and C signals are given by the following superpositions of pulse polarizations: $A=S_{xxyy}^{(3)}({\Omega }_3,t_2,{\Omega }_1)-S_{xyxy}^{(3)}({\Omega }_3,t_2,{\Omega }_1),B=S_{xyxy}^{(3)}({\Omega }_3,t_2,{\Omega }_1)-S_{xyyx}^{(3)}({\Omega }_3,t_2,{\Omega }_1)\text{and}C=S_{xxyy}^{(3)}({\Omega }_3,t_2,{\Omega }_1)-S_{xyyx}^{(3)}({\Omega }_3,t_2,{\Omega }_1).$