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Superposition of test-retest STEAM spectra (voxel size 2×2×2 cm3, TR 3 s, TE 10 ms, mixing time 50 ms, 96 averages, acquisition time 5 min) acquired during the two study sessions (#1 and #2, left) and their difference (right). Extra: Corresponding spectra of a subject on medication known to impact GABA concentrations.
