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. Author manuscript; available in PMC: 2012 Apr 25.
Published in final edited form as: Opt Express. 2012 Jan 2;20(1):403–413. doi: 10.1364/OE.20.000403

Fig. 2.

Fig. 2

Signal vs. variance measurement, showing experimental data (dots) and the fitted line. The line slope of 4.1 gives an estimate for the gain of g = 4.1 photons/count.