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(a) Low-temperature (100 K) 13C CP MAS spectra, (b) echo-detected 14N MAS spectra at 300 K and 5 kHz MAS of MAPbI3 (top) and K0.10MA0.90PbI3 (bottom), and (c) echo-detected 39K spectrum of K0.10MA0.90PbI3 at 300 K and 20 kHz MAS (20 s recycle delay, 12 h total acquisition time).
