Henderson, S., Bernert, M., Brida, D., Cavedon, M., David, P., Dux, R., Giroud, C., Huber, A., Kallenbach, A., Lomanowski, B., Meigs, A., Reimold, F., Wischmeier, M., Wiesen, S., EUROfusion MST1 Team, ASDEX Upgrade Team, Max Planck Institute for Plasma Physics, Max Planck Society, & JET Contributors (2021). Parameter dependences of the experimental nitrogen concentration required for detachment in ASDEX Upgrade and JET. Talk presented at 24th International Conference on Plasma Surface Interactions in Controlled Fusion Devices (PSI 24) (virtual). Jeju. 2021-01-25 - 2021-01-29.