Fig. 6.
Spectral selection in FSI. The multi-layer coating (black curve) reflects two bands centred on 17.4 nm and 30.4 nm. Zirconium (blue curve) and magnesium (red curve) filters are inserted in the beam near the focal plane to select one or the other. The entrance aluminium filter (light blue curve) transmits both bands. Data are from samples of the flight items.
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