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Scanning electronic microscopy images of randomly selected pieces of the SrTb2O4 crystal from the n regime (as marked in Figure 2). (a) Scale bar represents 20 μm, and the total scanned area is ∼22 × 13.8 μm. The magnification is 787×. We marked one area named B (see detailed analysis in the text). (b) Scale bar represents 2 μm, and the magnification is 3410×.
