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. 2021 Sep 28;21(19):6465. doi: 10.3390/s21196465

Figure 8.

Figure 8

Images of sample 2: (a) low-power pathology image used for correlation; (b) THz time-domain image; (c) frequency-domain image at 1.5 THz; (d) frequency-domain image at 1.75 THz [71].