File:Etendue conservation at maximum possible concentration.png
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![File:Etendue conservation at maximum possible concentration.png](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Etendue_conservation_at_maximum_possible_concentration.png/767px-Etendue_conservation_at_maximum_possible_concentration.png)
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current | 05:58, 11 October 2017 | ![]() | 966 × 755 (20 KB) | commons>Sgconlaw | Transferred from en.wikipedia |
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