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| spectral density (of energy) | |||
| spectral density; spectrum density | |||
| spectral; spectral density of ...; spectral concentration of ... | |||
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| spectral concentration; spectral distribution of a radiant, luminous or photon quantity | |||
| gęstość widmowa: 21 phrases in 5 subjects |
| Antennas and waveguides | 3 |
| Communications | 2 |
| Electronics | 8 |
| Lighting other than cinema | 5 |
| Radio | 3 |