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Background signal fitting. (A,B) The total background signal (blue), with contributions from direct water saturation (DS; orange) and the ssMT pool (yellow), is fitted according to Equations –4. Points between ±0.5 and ±10 ppm where CEST effects are expected to occur (crosses) were excluded from the background fit. (C,D) Fitted DS and ssMT pool amplitudes in arbitrary units
