Neighborhood definition for wavelength selection

Section 2.3. noted that the success of SA type algorithms strongly depends on the choice of the stepwidth. This requires an adequate definition of the term neighborhood for the wavelength search. 

The configuration generator in this study is regulated by significantly stricter rules  

Leave a certain fraction of the current subset unchanged, e.g., two thirds of the wavelengths. 

Restrict the overall distance between the current subset and the new combination. 

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