Powheg, Rivet, H7 : add MR submitted to 21.6 that did not reach master

Ewelina Maria Lobodzinskarequested to merge
ewelina/athena:master-mr into master

Powheg, Rivet, H7 : add MR submitted to 21.6 that did not reach master

Edited by Ewelina Maria Lobodzinska

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