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Figure 5: Black trace—generalized Mie theory calculations for the SERS EF for 60 nm diameter Au nanochains with a 1.5 nm interparticle separation, embedded in a medium with refractive index 𝑛 e = 1 . 5 . Blue trace—experimental SERS EF measurements for 60 nm diameter Au nanochains lying within one standard deviation from the average measured EF value for each chain length (i.e., “typical” results). Red trace—largest values for the SERS EF for each chain length measured in this experiment (i.e., “ideal” results). “Typical” results (blue trace) are normalized against the values for the “ideal” results (red trace) to illustrate the difference in magnitude between the two experimental data sets.