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Spectral efficiency
[ar] كفاءة طيفية
[ca] Eficiència espectral
[de] Spektrale Effizienz
[es] Eficiencia espectral
[fr] Efficacité spectrale
[it] Efficienza spettrale
[ja] スペクトル効率
[nl] Spectrale efficiëntie
[pl] Wydajność widmowa
[pt] Eficiência espectral