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Our goal is to fit a theoretical function to our measurements (power vs. angle) so we can integrate it and get the total power of the source.

At first we've been told to fit a gaussian, but then we saw that it's peak is "cut". We found in some book that a fit to f(x)=e^-(x^4) will give better results, and that the reason to this have something to do with the fact that the source isn't a perfect source point, i.e. it has finite dimensions.

I will be glad if someone could think of a reasonable explanation to this.

Thanks a lot!