Critical resection participation calculation examples. (A) Given a grid layout of 20 electrodes (teal circles) in which eight electrode positions will be resected (red region), we first rank each electrode based upon importance (e.g. highest HFO rate or highest centrality). The ranks are shown as numbers on each electrode. We then determine how many of the top N% (e.g. 10%, 20%, 30%) of those ranks will be resected. The CReP10 results in two of the top 2 (10% of 20 electrodes = 2, so CReP10 is ‘what percent of the top 2 ranks is resected’). Since ranks 1 and 2 are both resected, CReP10 = 100%. For CReP20, it is out of four electrodes (20*20%), and since ranks 1, 2 and 3 are resected but not 4, the CReP20 is 3/4 = 75%. CReP30 is four of the top six (20*30%). (B) A similar example with depth electrodes. CReP10 results in one of the top three (30*10%) ranked electrodes being resected, CReP20 with four of the top six (30*20%) electrodes being resected, and CReP30 with six of the top nine (30*30%) electrodes being resected.