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. 2019 Jun 13;7:440. doi: 10.3389/fchem.2019.00440

Figure 6.

Figure 6

1,100 × 3,100 μm2 maps of the SERS peaks located at (a) 200 cm−1, (b) 420 cm−1, (c) 900 cm−1, (d) 1,160 cm−1, (e) 1,360 cm−1, and (f) 1,600 cm−1.