Unsaturated linker. Comparison of DI and DII as a function of the NO-NO-midpoint-distance with the unsaturated linker. The D-value is given as percentage of DI and as absolute values in the inlay diagram. Results are given for DI (black filled upper triangles), distributed dipole approximation (DDPD, black filled circles), center of gravity approximation (DCOG, +) and point dipole approximation (DPD, x).