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4.2 K Mössbauer spectra of Int1 recorded in variable, parallel applied magnetic fields of (A) 0.2 T, (B) 0.5 T, (C) 1.0 T, (D) 2.0 T, and (E) 3.0 T. The black hash-mark curves are the spectra that result after subtraction of simulations for the minority FeII (6%) and FeIII (8%) contaminants from the raw data. The FeIII contaminant was simulated with parameters given in the caption of Figure S4. Red lines are spin Hamiltonian simulations using the parameters listed in Table 1.
