Dear Ken & colleagues, thanks for this very nice dissection of CP vs EP El Nino events. When you calculate the indices, how do you treat the large-scale background warming trends? Since these indices are anomalies relative to a fixed baseline period, a long-term warming trend (i.e., decadal) would project into the index by making it more 'extreme' for El Nino events at least. Is this accounted for? What impact does it have on the ENSO indices and their 'extremity' in recent years, is it important? thanks, Felix Landerer