How are errors determined in HwU files?

Asked by matteo maltoni

Dear MadGraph experts,

I'm trying to compare different ways to compute errors for some K-factor values, which I obtained from fixed-order generation.

In order to be more confident with this, I would like to know how are the errors assigned to the bin contents in the HwU file, since it seems to me that the "dy" values aren't related to the maximum and minimum results in the 9-point envelope, for each bin.

Can you please give me a short explanation, or point me to some reference?



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