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7: L'Héliographe[14]. | Download Scientific Diagram
![7: L'Héliographe[14]. | Download Scientific Diagram](https://www.researchgate.net/profile/Guedaouria-Hadja-2/publication/353495894/figure/download/fig1/AS:1050258247254018@1627412487538/LHeliographe14.png)