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(a) Visual, (b) H&E-stained and (c) THz-ATR images of glioma samples at temperature of -20 ℃ 35 ℃, the blue areas were the edge between sample and background. The red, green and black areas of (c) and (f) were the tumor tissue, normal tissue and background regions, respectively. The marked areas with dotted boxes 1 and 2 in (c) were the partial tumor and normal regions, respectively.
