The weight window does not work

Advanced Features and User Routines
19

This is what they correctly do, taking into proper account the particle weight.

You forgot to add the RANDOMIZe card, so all your cycles give identical results and do not allow you to calculate the statistical error in the resulting spectrum. When including it, you will see that the two curves are compatible within statistical errors.
After adjusting the weight window settings to the same logic as for importance biasing , namely

WW-FACTO  0.003906250.01171875                  C8        C8          1         
        what.1=0.5/(2**7)                                                       
        what.2=1.5/(2**7)

where the initial 0.5 to 1.5 weight window is scaled down by a factor 2 in each subsequent region, and after running a sufficient number of primaries in either case, you will find that the thermal peak perfectly overlaps, contrary to your figure above.

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