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. 2013 Nov 6;8(11):e77089. doi: 10.1371/journal.pone.0077089

Figure 2. Illustration of the notation in the SNR and CNR definitions: Inline graphic is the activation signal, Inline graphic the noise signal, Inline graphic defines the amplitude of the activation signal, and Inline graphic and Inline graphic indicate the standard deviation of the activation signal and noise signal respectively.

Figure 2