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Figure 6
Photon detection efficiency of the pnCCD detectors in the energy range below 600 eV. The red and green curves show the quantum efficiency of the detector modules with 50 nm and 150 nm aluminium entrance windows, respectively. These coatings were introduced to suppress detector background resulting from optical light, e.g. from stray light of strong optical lasers or ambient light inside the experimental chamber from windows or other instrumentation.

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