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Images of the test sample. (a) Optical photo, showing the liquid sample in the four quadrants. The numbers mark the percentage of glycerol in water for each quadrant. (b) Amplitude ESR image (normalized). (c) Image of the fitted T2. (d) Histogram of the fitted T2 values for the four different quadrants. The resolution of the ESR images is ∼30 × 30 μm.
