Step background function
HyperLab also fits regions with sharp background steps under the peaks.
This stepped background accounts for a Compton edge. Steps are fitted by one characteristic parameter, the Step Amplitude, which is relative to the amplitude of the Gaussian.
The picture shows a step with relative Amplitude=0.10.
Step's counts may be calculated by the following formula at channel x:
Step Amplitude relative to that of Gaussian
Amplitude of Gaussian
Gaussian width (Width = FWHM/1.66),
and erfc is the standard complementary error function.
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