01 photon

x=1 photon

x= 100*photons

Figure 2.2 The greater the number of photons, the better the signal-to-noise ratio. In this case study, the photon count across the face of the galaxy image varies from a mean value of 0.1 photons to a mean value of 10,000 photons. The signal-to-noise ratio equals the square root of the photon count.

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