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. 2019 Aug 16;411(26):6969–6981. doi: 10.1007/s00216-019-02069-6

Fig. 2.

Fig. 2

Top: false colour K-means cluster images of healthy colon tissue without the lens (left) and with the lens (right) obtained by mapping from nine stitched images. Each of the chemical images has a size of 510 × 510 μm2. Cluster represented in light blue shade (box) indicates the edges of the tissue. Bottom: the average measured spectra from the areas representing the edges of the tissue