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Figure 2
(a) Photocurrent I produced by the diode as a function of the incident photon flux. (b) Response of the active beamstop monitor for different energies (the errors are within the size of the symbol except for 6 keV, measured with a lower photon flux). (c) Time series of the beamstop photocurrent (red) and the ring current (black). In the magnified insert the `topping up' operation of PETRA III is reflected in the measured photocurrent.

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