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Superposed epoch analysis (SEA) for detrended δ13C, δ18O and δ2H and RWI of (a) silver fir and (b) Douglas-fir considering the drought years 2003, 2015 and 2018 (see Figs S1 and S2 available as Supplementary data at Tree Physiology Online). Significant departures (P ≤ 0.05) from 1000 random simulations are represented with filled circles.
