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

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Copyright © 2019 Kolhatkar, Parisien, Ruediger and Muehlethaler.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) 100 ×100 μm² map of the integrated intensity between 640 and 750 nm acquired with a 5 μm spatial resolution on a reference sample consisting of a fingermark on a glass cover slide with no gold NP and (B) example of a spectrum obtained from the map. The gray region indicates the integrated intensity range.