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Simultaneous recording of fluorescence images taken
through (a) 448- and (b) 600-nm filters (two-channel
method). The image of the ratio
False-colored image with pixels superimposed upon a photograph of the northern portal. Areas with different characteristics can be identified. Thus pixels with 12th-century stone characteristics are shown in blue-indigo, and those with 19th-century characteristics are shown in green. The violet pixels correspond to areas that exhibit iron-ion quenching. The normalized chlorophyll pixels from Fig. 8 (in Ref. 1) have been merged in red color tones: Pixels with a large amount of biodeteriogen PC1 are light red, those with a high PC2 score are darker red, and those with low PC1 and PC2 scores are shown in a very dark red color.