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Figure 4
Determination of the ratio w/L and center channel for a linear detector with pixel size of 50 µm from the variation of the beam position during a scan through the primary beam. The upper plot shows the channel numbers at which the primary beam is observed during the scan versus the detector angle. Furthermore the fits of equation (12)[link] to the recorded data are shown by black lines. The lower plot shows the same data set and fits but with the linear trend subtracted. A fit with (full line) and without (dashed line) considering a detector tilt is shown for two detector distances of 250 and 380 mm. In the upper plot these two fits are indistinguishable.

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