Figure 2 | Scientific Reports

Figure 2

From: COVID-19 salivary Raman fingerprint: innovative approach for the detection of current and past SARS-CoV-2 infections

Figure 2

Subtraction Raman spectra of (a) the average CTRL signal versus the average signal of COV+  , (b) the average CTRL signal versus the average COV- spectrum and c) the average COV+  signal versus the average COV− signal. The ± 0.005 ∆I interval is indicated in the graphs, confirmed by the error propagation from the spectra standard deviation. d) Overlapped average spectra of CTRL, COV+  and COV− with the main different regions highlighted.

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