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. 2021 Jan 6;9:52. Originally published 2020 Jan 27. [Version 4] doi: 10.12688/f1000research.22149.4

Figure 1. Cross-spectrum (CS) of S1 proteins.

Figure 1.

( a) CS of S1 from SARS-CoV, MERS-CoV and SARS-CoV-2; ( b) CS of Bat SARS-like CoV and SARS-CoV-2. The abscissa represents the frequencies from the Fourier transform of the sequence of electron-ion interaction potential corresponding to the amino-acid sequence of proteins. The lowest frequency is 0.0 and the highest is 0.5. The ordinate represents the signal-to-noise ratio (the ratio between signal intensity at one particular IS frequency and the main value of the whole spectrum, S/N).