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![Parabolic trough systems with pre-heater [5]. | Download Scientific Diagram](https://www.researchgate.net/publication/320622982/figure/fig3/AS:614012333080608@1523403356541/Parabolic-trough-systems-with-pre-heater-5.png "Parabolic trough systems with pre-heater [5]. | Download Scientific Diagram")
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