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Figure 6.8. The Poisson (step curve) and normal distributions (smooth curves) for the mean value m = 100. The normal distribution is given for two values of the width parameter aw which is shown in the text to be equal to the standard deviation a. The Poisson distribution approximates well the normal distribution if the latter has a = *Jm. Note the slight asymmetry of the Poisson distribution relative to the normal distribution. The standard deviation and full width half maximum widths are shown for the higher normal peak; the two normal curves happen to cross at the FWHM point.

100 m x

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