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Figure 3
Top: vertical/horizontal optical beam path (not to scale). Sh/v is the size of the X-ray source, σSSh/v is the size of the beam at the SS position, SSSh/v is the size of the SS aperture and σh/v is the size of the focused nanobeam. p1h/v and q1h/v are the source-to-prefocusing-mirror and mirror-to-SS distances, respectively, p2h/v is the source distance, q2h/v is the image distance and dn is the optical aperture of the nano-focusing optics. Bottom: beam footprint captured by the imagers along the beam path. The white rectangle on the Diagon shows the size of the front-end aperture, and the light-blue rectangle positioned at the SS image represents a typical secondary source size. The last image shows a coherent diffraction pattern of a Siemens star.

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