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Calculation of spin coupling (Ω) for M2TM reconstituted into PC/PE bilayers. Ω is the ratio of the dilute-labeled spectral peak-to-peak amplitude at the central resonance line (M=0) to that of the fully labeled sample. At large spin-spin distances, Ω is approximately one (no spin-spin coupling) but increases as spin labels approach each other. The grey box indicates the limiting conformation discussed in the text.
