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Theory uncertainties

Nicolas Postiau requested to merge npostiau/shears:systematic_uncertainties into master

Implementation of theory uncertainties for the analysis, based on LHE weights: scale, PDF, alpha_S. Now we have the shapes if we run on "all" systs.

This does NOT take into account the Stewart-Tackman prescription etc: this is to be done on the basis of the shapes, after we have the final results.

In some rare cases with ZZ2l2v samples, the weights were not filled properly in the MiniAOD (a bug?). I removed these events at the baobab level to be sure. It affected roughly 2% of the events (I think).

Edited by Nicolas Postiau

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