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of the assumptions made are not completely fulfilled. For example, in Fig. 4b) it can be seen, that the sample may not be treated as a point source. Nevertheless, accepting this factor two, the profiles of the measurements are highly comparable. 

With this information the expected beam shape on a screen can be calculated from the spectro-goniometer data or even from simulation data, which opens further possibilities for sample optimization. The first step to be done is to transform the spectra. In Fig. 11, this is shown for the experimental data. Of course, this transformation leads to an enhancement of low-angle parts, shifting the maximum to a lower angle. Subsequently, the CIE-XYZ coordinates are calculated for each angle, using the CIE2006 colour-matching functions. 3 

<img src='content_image/299926.jpg'>

<img src='content_image/299927.jpg'>

