File:Helmholtz-Kohlrausch effect.svg
![File:Helmholtz-Kohlrausch effect.svg](https://upload.wikimedia.org/wikipedia/commons/thumb/e/e6/Helmholtz-Kohlrausch_effect.svg/800px-Helmholtz-Kohlrausch_effect.svg.png?20171002140741)
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