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Figure 11
Helium box: the new design. The maximum polar angles are ±63°. A double window filled with warm helium replaces the Mylar window shown in Fig. 1 , in order to avoid the formation of frost at the outer surface of this window. The second Mylar window, of thickness 6 µm, would decrease the transmission by almost 30% at wavelengths near the K-edge of phosphorus. |


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