Both Ewald and

Darwin curves

have a horizontal plateau with a total width .

The FWHM, the convolution factors and the integrated intensity of both curves in units of are given by:

	Ewald curve	Darwin curve
FWHM
Convolution factor f
Integrated intensity

The convolution factor f is defined here by the FWHM of the respective curve convoluted with itself. For the sake of simplicity we have neglected these factors in the the description of the theory.