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Bar charts showing the percentage of measurements from outside the nucleus, inside the nucleus, and unknown locations, as deduced from the PLS-DA model, which shows characteristic Raman bands due to (a) anatase TiO2, (b) α-FeO(OH), or (c) mixtures of α-FeO(OH) and TiO2. The asterisk (∗) in panel a shows the result from single-point measurements after 4 h of exposure.
