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| fotografische Schwärzung (the logarithm of the radiant flux incident on the sample to the radiant flux transmitted by the sample) | |||
| photographische Schwärzung | |||
| visuelle optische Dichte; optische Dichte; photographische Dichte | |||
| photographic: 3 phrases in 2 subjects |
| Cultural studies | 1 |
| Natural resourses and wildlife conservation | 2 |