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gęstość widmowa
el., acoust.	densidade espectral
metrol.	densidade espectral de …; espectral
gęstość widmowa wielkości energetycznej, świetlnej lub fotonowej
light.	distribuição espectral de uma grandeza energética, luminosa ou fotónica

gęstość widmowa: 19 phrases in 5 subjects

Antennas and waveguides	6
Communications	1
Electronics	5
Lighting other than cinema	5
Radio	2