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Davies ENDOR of E4(2H)* at g3 showing resolved 57Fe centers (top) and their hyperfine couplings signing by PESTRE technique (low), where (Materials and Methods) phase I is sequences 1–75, phase II is 76–99, and III is 100 onward. PESTRE conditions: T = 2 K; microwave frequency, 34.90 GHz; t(π/2) = 40 ns, τ = 600 ns; TRF = 35 μs; repetition time, 100 ms; 100–200 scans.
